TIBPAL20L8/R4/6/8-25C Datasheet by Texas Instruments

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Direct Replacement Ior PAL20L8A, PAL20R4A, PAL20R6A, PALZOLSA, with at Least 50% Reduction in Power Preload Capability on Output Registers Simplifies Testing Power-Up Clear on Registered Devices (All Register Outputs are Set Low, but Voltage Levels at the Output Pins Go High) Package Options Include Plastic Chip Carriers in Addition to Plastic and Ceramic DIPS Dependable Texas Instruments Quality and Reliability iio I 3-STATE REGISTERED DEV'CE INPUTS o OUTPUTS o OUTPUTS P05“ PALZULB 14 2 n s PALZORA 12 o 4 {firslale bullets) A PALZORG 12 o s {firslale bullets) 2 PALZORB 12 o a {firslale bullets) o description These programmable array logic devlces feature high speed and functional equivalency when compared with currently available devices. These IMPACT circuits combine the latest AdvancedLowrPower Schottky technology with proventltaniumrtungstenlusestoprovidereliable, highrperformance substitutes for conventional [ ] [ ] [ ] I[ 4 21] I[ 5 20] I[ 6 19] I[ 7 13] I[ a 17] I[ 9 16] I[ 10 15] I[ 11 14] GND[ 12 13] TTL logic. Their easy programmability allows torquick design of custom functlons and typ compact circuit board. In addition, chip carriers are available for futher reductlon ln boa All of the reglsteroutputs are setto a low level during powerrup. Extra clrcuitry has been pr ofeach registerasynchronously to either a high or low state. This feature Simplifiestestlng can be set to an initial state prior to executing the test sequence. The TIBPALZO’ C series is characterized lrom 0°C to 75"C. These devices are covered by U.S. Patent 4 410 987 lMPACT iS a trademark Di Texas lnsirurnentS Incorporated, PAL is a registered trademark of Advanced Micro Devices lnc. PRODMC‘HON mummiian lscvneniuol pvhl ion-me mam mnimm la speclllcullons w lhe terms ol mu lnstmmenu mam warnriiy Producilori processlng does nol nemuunly include Iesilng 01 .ii minim. INSTRUMENTS POST OFFlCE Box 655303 - DALLAS TEXAS 75255 misfit copyrigm 19921 i—ii—ii—ii—ii—ii—ii—i
TIBPAL20L8-25C, TIBPAL20R4-25C, TIBPAL20R6-25C, TIBPAL20R8-25C
LOW-POWER HIGH-PERFORMANCE IMPACT PAL CIRCUITS
SRPS022 – D2920, MAY 1987 – REVISED MARCH 1992
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
Copyright 1992, Texas Instruments Incorporated
1
PRODUCTION DATA information is current as of publication date. Products
conform to specifications per the terms of Texas Instruments standard
warranty. Production processing does not necessarily include testing of all
parameters.
Low-Power, High-Performance
Reduced ICC of 105 mA Max
fmax:
Without Feedback . . . 33 MHz Min
With Feedback . . . 25 MHz Min
tpd . . . 25 ns Max
Direct Replacement for PAL20L8A,
PAL20R4A, PAL20R6A, PAL20L8A, with at
Least 50% Reduction in Power
Preload Capability on Output Registers
Simplifies Testing
Power-Up Clear on Registered Devices (All
Register Outputs are Set Low, but Voltage
Levels at the Output Pins Go High)
Package Options Include Plastic Chip
Carriers in Addition to Plastic and Ceramic
DIPs
Dependable Texas Instruments Quality and
Reliability
DEVICE I
INPUTS 3-STATE
O OUTPUTS REGISTERED
Q OUTPUTS
I/O
PORT
S
PAL20L8 14 2 0 6
PAL20R4 12 0 4 (3-state buffers) 4
PAL20R6 12 0 6 (3-state buffers) 2
PAL20R8 12 0 8 (3-state buffers) 0
description
These programmable array logic devices feature
high speed and functional equivalency when
compared with currently available devices. These
IMPACT circuits combine the latest
AdvancedLow-Power Schottky technology with
proven titanium-tungsten fuses to provide reliable,
high-performance substitutes for conventional
TTL logic. Their easy programmability allows forquick design of custom functions and typically results in a more
compact circuit board. In addition, chip carriers are available for futher reduction in board space.
All of the register outputs are set to a low level during power-up. Extra circuitry has been provided to allow loading
of each register asynchronously to either a high or low state. This feature simplifies testing because the registers
can be set to an initial state prior to executing the test sequence.
The TIBPAL20’ C series is characterized from 0°C to 75°C.
These devices are covered by U.S. Patent 4,410,987
IMPACT is a trademark of Texas Instruments Incorporated.
PAL is a registered trademark of Advanced Micro Devices Inc.
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
I
I
I
I
I
I
I
I
I
I
I
GND
VCC
I
O
I/O
I/O
I/O
I/O
I/O
I/O
O
I
I
TIBPAL20L8’
JT OR NT PACKAGE
(TOP VIEW)
3212827
12 13
5
6
7
8
9
10
11
25
24
23
22
21
20
19
I/O
I/O
I/O
NC
I/O
I/O
I/O
I
I
I
NC
I
I
I
426
14 15 16 17 18
I
I
GND
NC
I
I
O
I
I
I
NC
I
O
TIBPAL20L8’
FN PACKAGE
(TOP VIEW)
NC No internal connection
Pin assignments in operating mode
VCC
u—u—u—u—u—u—u—u u—u—u—u—u—u—u—u u—u—u—u—u—u—u—u TEXAS {9 INSTRUMENTS POSI OFFICE BOX 655303 - DALLAS TEXAS 75255
TIBPAL20R4-25C, TIBPAL20R6-25C, TIBPAL20R8-25C
LOW-POWER HIGH-PERFORMANCE IMPACT PAL CIRCUITS
SRPS022 – D2920, MAY 1987 – REVISED MARCH 1992
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
2
CLK
I
I
I
I
I
I
I
I
I
I
GND
I
I/O
I/O
Q
Q
Q
Q
I/O
I/O
I
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
VCC
OE
TIBPAL20R4’
JT OR NT PACKAGE
(TOP VIEW)
I
I
GND
NC
I
I/O
I
I
CLK
NC
I
I/O
(TOP VIEW)
VCC
11 19
12 13 14 15 16 17 18
4
10
9
8
7
6
5 I/O
20
21
22
23
24
25
3 2 1 282726
I
I
I
NC
I
I
I
Q
Q
NC
Q
Q
I/O
TIBPAL20R4’
FN PACKAGE
NC No internal connection
OE
CLK
I
I
I
I
I
I
I
I
I
I
GND
I
I/O
Q
Q
Q
Q
Q
Q
I/O
I
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13 OE
I
I
GND
NC
I
I/O
I
I
CLK
NC
I
I/O
VCC
11 19
12 13 14 15 16 17 18
4
10
9
8
7
6
5Q
20
21
22
23
24
25
3 2 1 282726
I
I
I
NC
I
I
I
Q
Q
NC
Q
Q
Q
OE
VCC
(TOP VIEW)
TIBPAL20R6’
JT OR NT PACKAGE
(TOP VIEW)
TIBPAL20R6’
FN PACKAGE
CLK
I
I
I
I
I
I
I
I
I
I
GND
I
Q
Q
Q
Q
Q
Q
Q
Q
I
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13 OE
I
I
GND
NC
I
Q
I
I
CLK
NC
I
Q
VCC
11 19
12 13 14 15 16 17 18
4
10
9
8
7
6
5Q
20
21
22
23
24
25
3 2 1 282726
I
I
I
NC
I
I
I
Q
Q
NC
Q
Q
Q
OE
VCC
(TOP VIEW)
TIBPAL20R8’
JT OR NT PACKAGE
(TOP VIEW)
TIBPAL20R8’
FN PACKAGE
Pin assignments in operating mode
/\, denotes (used mpuls TEXAS {9 INSTRUMENTS POST omcE aox 555303 - DALLAS TEXAS 75265
TIBPAL20L8-25C, TIBPAL20R4-25C
LOW-POWER HIGH-PERFORMANCE IMPACT PAL CIRCUITS
SRPS022 – D2920, MAY 1987 – REVISED MARCH 1992
POST OFFICE BOX 655303 DALLAS, TEXAS 75265 3
functional block diagrams (positive logic)
O
O
I/O
I/O
I/O
I/O
I/O
I/O
I
EN 1
&
40 X 64
14 20
206
7
7
7
7
7
7
7
7
6
20 x
denotes fused inputs
Q
I/O
I/O
I/O
I/O
I
EN
12 20
204
7
7
7
8
8
8
7
4
20 x
1
&
40 X 64 1
8
Q
Q
Q
4
1D
I = 0 2
CLK C1
EN 2
OE
4
TIBPAL20L8’
TIBPAL20R4’
TIBPALZORB‘ 3/ « , denotes (used mpuls TEXAS {9 INSTRUMENTS 4 p057 OFFICE aox 655303 - DALLAS IEXAS 752s5
TIBPAL20R6-25C, TIBPAL20R8-25C
LOW-POWER HIGH-PERFORMANCE IMPACT PAL CIRCUITS
SRPS022 – D2920, MAY 1987 – REVISED MARCH 1992
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
4
functional block diagrams (positive logic)
denotes fused inputs
TIBPAL20R6’
TIBPAL20R8’
Q
I/O
I/O
I
EN
12 20
202
7
8
8
8
7
2
20 x
1
&
40 X 64 1
8
Q
Q
Q
6
1D
I = 0 2
CLK C1
EN 2
OE
6
8Q
8Q
Q
I12 20
208
8
8
8
8
20 x
8
Q
Q
Q
1D
I = 0 2
CLK C1
EN 2
8Q
8Q
&
40 X 64 1
OE
8Q
8Q
Tums {9 INSTRUMENTS
4 8 12 16 20 24 28 32
I3
I4
I5
I6
I7
I8
I9
I10
O
22
I/O
21
I/O
20
I/O
19
I/O
18
I/O
17
I/O
16
O
15
I
14
Increment
I1
Fuse number = First fuse number + Increment
Pin numbers shown are for JT and NT packages.
0
40
80
120
160
200
240
280
320
360
400
440
480
520
560
600
640
680
720
760
800
840
880
920
960
1000
1040
1080
1120
1160
1200
1240
1280
1320
1360
1400
1440
1480
1520
1560
1600
1640
1680
1720
1760
1800
1840
1880
1920
1960
2000
2040
2080
2120
2160
2200
2240
2280
2320
2360
2400
2440
2480
2520
First Fuse
Numbers
36 390
I2I
23
I11 I
13
TIBPAL20L8-25C
LOW-POWER HIGH-PERFORMANCE IMPACT PAL CIRCUITS
SRPS022 – D2920, MAY 1987 – REVISED MARCH 1992
POST OFFICE BOX 655303 DALLAS, TEXAS 75265 5
logic diagram (positive logic)
11 Fuse number = first luse number + \ncremenl Pm numbers shown are {or JT and NT packages, TEXAS {9 INSTRUMENTS
Fuse number = First fuse number + Increment
Pin numbers shown are for JT and NT packages.
4 8 12 16 20 24 28 32
I3
I4
I5
I6
I7
I8
I9
I10
I/O
22
I/O
21
I/O
16
I/O
15
Increment
0
40
80
120
160
200
240
280
320
360
400
440
480
520
560
600
640
680
720
760
800
840
880
920
960
1000
1040
1080
1120
1160
1200
1240
1280
1320
1360
1400
1440
1480
1520
1560
1600
1640
1680
1720
1760
1800
1840
1880
1920
1960
2000
2040
2080
2120
2160
2200
2240
2280
2320
2360
2400
2440
2480
2520
First Fuse
Numbers
36 390
I2I
23
I11 I
14
Q
20
Q
19
Q
18
Q
17
C1
1D
I = 0
C1
1D
I = 0
C1
1D
I = 0
C1
1D
I = 0
13 OE
CLK 1
TIBPAL20R4-25C
LOW-POWER HIGH-PERFORMANCE IMPACT PAL CIRCUITS
SRPS022 – D2920, MAY 1987 – REVISED MARCH 1992
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
6
logic diagram (positive logic)
Fuse number: er51 luse number + \ncremenl Pm numbers shown are {or JT and NT packages,
Fuse number = First fuse number + Increment
Pin numbers shown are for JT and NT packages.
4 8 12 16 20 24 28 32
I3
I4
I5
I6
I7
I8
I9
I10
I/O
22
I/O
15
Increment
0
40
80
120
160
200
240
280
320
360
400
440
480
520
560
600
640
680
720
760
800
840
880
920
960
1000
1040
1080
1120
1160
1200
1240
1280
1320
1360
1400
1440
1480
1520
1560
1600
1640
1680
1720
1760
1800
1840
1880
1920
1960
2000
2040
2080
2120
2160
2200
2240
2280
2320
2360
2400
2440
2480
2520
First Fuse
Numbers
36 390
I2I
23
I11 I
14
Q
20
Q
19
Q
18
Q
17
C1
1D
I = 0
C1
1D
I = 0
C1
1D
I = 0
C1
1D
I = 0
13 OE
CLK 1
Q
21
C1
1D
I = 0
Q
16
C1
1D
I = 0
TIBPAL20R6-25C
LOW-POWER HIGH-PERFORMANCE IMPACT PAL CIRCUITS
SRPS022 – D2920, MAY 1987 – REVISED MARCH 1992
POST OFFICE BOX 655303 DALLAS, TEXAS 75265 7
logic diagram (positive logic)
Fuse number: Frrsl luse number + \ncremenl OE Pm numbers shown are {or JT and NT packages, TEXAS {9 INSTRUMENTS
Fuse number = First fuse number + Increment
Pin numbers shown are for JT and NT packages.
4 8 12 16 20 24 28 32
I3
I4
I5
I6
I7
I8
I9
I10
Increment
0
40
80
120
160
200
240
280
320
360
400
440
480
520
560
600
640
680
720
760
800
840
880
920
960
1000
1040
1080
1120
1160
1200
1240
1280
1320
1360
1400
1440
1480
1520
1560
1600
1640
1680
1720
1760
1800
1840
1880
1920
1960
2000
2040
2080
2120
2160
2200
2240
2280
2320
2360
2400
2440
2480
2520
First Fuse
Numbers
36 390
I2I
23
I11 I
14
Q
20
Q
19
Q
18
Q
17
C1
1D
I = 0
C1
1D
I = 0
C1
1D
I = 0
C1
1D
I = 0
13 OE
CLK 1
Q
21
C1
1D
I = 0
Q
16
C1
1D
I = 0
Q
22
C1
1D
I = 0
Q
15
C1
1D
I = 0
TIBPAL20R8-25C
LOW-POWER HIGH-PERFORMANCE IMPACT PAL CIRCUITS
SRPS022 – D2920, MAY 1987 – REVISED MARCH 1992
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
8
logic diagram (positive logic)
TEXAS {9 INSTRUMENTS
TIBPAL20L8-25C, TIBPAL20R4-25C, TIBPAL20R6-25C, TIBPAL20R8-25C
LOW-POWER HIGH-PERFORMANCE IMPACT PAL CIRCUITS
SRPS022 – D2920, MAY 1987 – REVISED MARCH 1992
POST OFFICE BOX 655303 DALLAS, TEXAS 75265 9
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, VCC (see Note 1) 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage (see Note 1) 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage applied to disabled output (see Note 1) 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range 0°C to 75°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range 65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NOTE 1: These ratings apply except for programming pins during a programming cycle.
recommended operating conditions
MIN NOM MAX UNIT
VCC Supply voltage 4.75 5 5.25 V
VIH High-level input voltage 2 5.5 V
VIL Low-level input voltage 0.8 V
IOH High-level output current 3.2 mA
IOL Low-level output current 24 mA
fclockClock frequency 0 33 MHz
High 15
Low 15
tsuSetup time, input or feedback before clock25 ns
thHold time, input or feedback after clock0 ns
TAOperating free-air temperature 0 25 75 °C
fclock, tw, tsu, and th do not apply for TIBPAL20L8’.
ns
Pulse duration, clock tw
TEXAS {9 INSTRUMENTS
VO = 0.4 V
IOZL VCC = 5.25 V, µA
VO = 2.7 V
IOZH VCC = 5.25 V, µA
fmaxMHz
TIBPAL20L8-25C, TIBPAL20R4-25C, TIBPAL20R6-25C, TIBPAL20R8-25C
LOW-POWER HIGH-PERFORMANCE IMPACT PAL CIRCUITS
SRPS022 – D2920, MAY 1987 – REVISED MARCH 1992
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
10
electrical characteristics over recommended operating free-air temperature range
PARAMETER TEST CONDITIONS MIN TYPMAX UNIT
VIK VCC = 4.75 V, II = –18 mA –0.8 –1.5 V
VOH VCC = 4.75 V, IOH = –3.2 mA 2.4 3.3 V
VOL VCC = 4.75 V, IOL = 24 mA 0.3 0.5 V
O, Q outputs 20
I/O ports 100
O, Q outputs –20
I/O ports 250
IIVCC = 5.25 V, VI = 5.5 V 0.1 mA
IIHVCC = 5.25 V, VI = 2.7 V 20 µA
IILVCC = 5.25 V, VI = 0.4 V 0.25 mA
IOS§VCC = 5.25 V, VO = 0 –30 –70 –130 mA
ICC VCC = 5.25 V,
Outputs open, VI = 0,
OE at VIH 75 105 mA
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted)
PARAMETER FROM
(INPUT) TO
(OUTPUT) TEST CONDITION MIN TYPMAX UNIT
With feedback 25 40
Without feedback 33 50
tpd I, I/O O, I/O R1 = 200 Ω, 3 14 25 ns
tpd CLKQR2 = 390 Ω, 2 10 15 ns
ten OE Q See Figure 3 2 8 15 ns
tdis OEQ 2 8 15 ns
ten I, I/O O, I/O 3 15 25 ns
tdis I, I/O O, I/O 3 15 25 ns
All typical values are at VCC = 5 V, TA = 25°C.
For I/O ports, the parameters IIH and IIL include the off-state output current.
§Not more than one output should be shorted at a time, and the duration of the short-circuit should not exceed one second.
fmax(with feedback) 1
tsu tpd (CLK to Q), fmax(without feedback) 1
twhigh twlow
,
fmax does not apply for TIBPAL20L8,.
TEXAS {9 S’TRUMENTS IN
TIBPAL20L8-25C, TIBPAL20R4-25C, TIBPAL20R6-25C, TIBPAL20R8-25C
LOW-POWER HIGH-PERFORMANCE IMPACT PAL CIRCUITS
SRPS022 – D2920, MAY 1987 – REVISED MARCH 1992
POST OFFICE BOX 655303 DALLAS, TEXAS 75265 11
programming information
Texas Instruments programmable logic devices can be programmed using widely available software and
inexpensive device programmers.
Complete programming specifications, algorithms, and the latest information on hardware, software, and
firmware are available upon request. Information on programmers capable of programming Texas Instruments
programmable logic is also available, upon request, from the nearest TI field sales office, local authorized TI
distributor, or by calling Texas Instruments at (214) 997-5666.
preload procedure for registered outputs (see Figure 1 and Notes 2 and 3)
The output registers can be preloaded to any desired state during device testing. This permits any state to be
tested without having to step through the entire state-machine sequence. Each register is preloaded individually
by following the steps given below.
Step 1. With VCC at 5 volts and Pin 1 at VIL, raise Pin 13 to VIHH.
Step 2. Apply either VIL or VIH to the output corresponding to the register to be preloaded.
Step 3. Pulse Pin 1, clocking in preload data.
Step 4. Remove output voltage, then lower Pin 13 to VIL. Preload can be verified by observing the
voltage level at the output pin.
td
tsu tw
td
VIHH
VIL
VIL
VOL
VOH
VIH
Pin 13
Pin 1
Registered I/O Input Output
VIH
VIL
Figure 1. Preload Waveforms
NOTES: 2. Pin numbers shown are for JT and NT packages only. If chip carrier socket adapter is not used, pin numbers must be changed
accordingly.
3. td = tsu = th = 100 ns to 1000 ns VIHH = 10.25 V to 10.75 v
TEXAS {9 S’TRUMENTS IN
TIBPAL20L8-25C, TIBPAL20R4-25C, TIBPAL20R6-25C, TIBPAL20R8-25C
LOW-POWER HIGH-PERFORMANCE IMPACT PAL CIRCUITS
SRPS022 – D2920, MAY 1987 – REVISED MARCH 1992
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
12
power-up reset (see Figure 2)
Following power up, all registers are reset to zero. This feature provides extra flexibility to the system designer
and is especially valuable in simplifying state-machine initialization. To ensure a valid power-up reset, it is
important that the rise of VCC be monotonic. Following power-up reset, a low-to-high clock transition must not
occur until all applicable input and feedback setup times are met.
1.5 V
tsu
tpd
tw
VIL
VIH
5 V
VCC
Active Low
Registered Output
CLK
4 V
VOH
VOL
1.5 V
(600 ns TYP, 1000 ns MAX)
1.5 V
This is the power-up reset time and applies to registered outputs only. The values shown are from characterization data.
This is the setup time for input or feedback.
Figure 2. Power-Up Reset Waveforms
\ —H—H “—f 4‘ {+ +1 \+ ‘ \ ‘ ,7, ‘ iiiL‘, ‘ x 1; ‘ ‘E,,i n—p‘P % w y TEXAS {9 INSTRUMENTS p057 OFFICE BOX 655303 - DALLAS IEXAS 752s5
TIBPAL20L8-25C, TIBPAL20R4-25C, TIBPAL20R6-25C, TIBPAL20R8-25C
LOW-POWER HIGH-PERFORMANCE IMPACT PAL CIRCUITS
SRPS022 – D2920, MAY 1987 – REVISED MARCH 1992
POST OFFICE BOX 655303 DALLAS, TEXAS 75265 13
PARAMETER MEASUREMENT INFORMATION
tsu
S1
R2
CL
(see Note A)
LOAD CIRCUIT FOR
3-STATE OUTPUTS
3.5 V
0.3 V
1.5 V
1.5 V
th
1.5 V
tpd
tpd
tpd
tpd
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
VOH
VOH
VOL
VOL
1.5 V 1.5 V
1.5 V 1.5 V
tw
1.5 V 1.5 V
3.3 V
VOL
VOH
VOH –0.5 V
0 V
ten
ten
tdis
tdis
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES, 3-STATE OUTPUTS
VOLTAGE WAVEFORMS
PULSE DURATIONS
1.5 V 1.5 V
1.5 V
1.5 V 1.5 V
1.5 V 1.5 V
1.5 V
R1
VOL +0.5 V
5 V
3.5 V
0.3 V
3.5 V
0.3 V
3.5 V
0.3 V
3.5 V
0.3 V
3.5 V
0.3 V
From Output
Under Test Test
Point
Input
Out-of-Phase
Output
(see Note D)
Timing
Input
Data
Input
In-Phase
Output
High-Level
Pulse
Low-Level
Pulse
Output
Control
(low-level
enabling)
Waveform 1
S1 Closed
(see Note B)
Waveform 2
S1 Open
(see Note B)
NOTES: A. CL includes probe and jig capacitance and is 50 pF for tpd and ten, 5 pF for tdis.
B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control. Waveform 2
is for an output with internal conditions such that the output is high except when disabled by the output control.
C. All input pulses have the following characteristics: PRR 1 MHz, tr and tf 2 ns, duty cycle = 50%.
D. When measuring propagation delay times of 3-state outputs, switch S1 is closed.
E. Equivalent loads may be used for testing.
Figure 3. Load Circuit and Voltage Waveforms
{9 TEXAS INSTRUMENTS
B0892
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{'4’ TEXAS INSTRUMENTS
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1992 Texas Instruments Incorporated
SRPS022
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In order to minimize risks associated with the customer’s applications, adequate design and operating
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Copyright 1998, Texas Instruments Incorporated

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