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CD54AC74 Datasheet(PDF) 6 Page - Texas Instruments

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Part No. CD54AC74
Description  DUAL POSITIVE-EDGE-TRIGGERED D-TYPE FLIP-FLOPS WITH CLEAR AND PRESET
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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CD54AC74, CD74AC74
DUAL POSITIVE-EDGE-TRIGGERED D-TYPE FLIP-FLOPS
WITH CLEAR AND PRESET
SCHS231D – SEPTEMBER 1998 – REVISED DECEMBER 2002
6
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
VOLTAGE WAVEFORMS
SETUP AND HOLD AND INPUT RISE AND FALL TIMES
th
tsu
50% VCC
50% VCC
50%
10%
10%
90%
90%
VCC
VCC
0 V
0 V
tr
tf
Reference
Input
Data
Input
VOLTAGE WAVEFORMS
PROPAGATION DELAY AND OUTPUT TRANSITION TIMES
50% VCC
50% VCC
50%
10%
10%
90%
90%
VCC
VOH
VOL
0 V
tr
tf
Input
In-Phase
Output
50% VCC
tPLH
tPHL
50% VCC
50%
10%
10%
90%
90%
VOH
VOL
tr
tf
tPHL
tPLH
Out-of-Phase
Output
NOTES: A. CL includes probe and test-fixture capacitance.
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 are supplied by generators having the following characteristics: PRR
≤ 1 MHz, ZO = 50 Ω, tr = 3 ns, tf = 3 ns.
Phase relationships between waveforms are arbitrary.
D. For clock inputs, fmax is measured with the input duty cycle at 50%.
E. The outputs are measured one at a time with one input transition per measurement.
F. tPLH and tPHL are the same as tpd.
G. tPZL and tPZH are the same as ten.
H. tPLZ and tPHZ are the same as tdis.
From Output
Under Test
CL = 50 pF
(see Note A)
LOAD CIRCUIT
S1
2
× VCC
R1 = 500
Ω†
Open
GND
0 V
tw
VOLTAGE WAVEFORMS
PULSE DURATION
Input
50% VCC
50% VCC
VCC
tPLH/tPHL
tPLZ/tPZL
tPHZ/tPZH
Open
2
× VCC
GND
TEST
S1
Output
Control
Output
Waveform 1
S1 at 2
× VCC
(see Note B)
Output
Waveform 2
S1 at GND
(see Note B)
VOL
VOH
tPZL
tPZH
tPLZ
tPHZ
≈VCC
0 V
50% VCC
20% VCC
50% VCC
≈0 V
VOLTAGE WAVEFORMS
OUTPUT ENABLE AND DISABLE TIMES
50% VCC
50% VCC
80% VCC
VCC
R2 = 500
Ω†
† When VCC = 1.5 V, R1 = R2 = 1 kΩ
VOLTAGE WAVEFORMS
RECOVERY TIME
50% VCC
VCC
0 V
CLR
Input
CLK
50% VCC
VCC
trec
0 V
Figure 1. Load Circuit and Voltage Waveforms




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