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SN74LS160A Datasheet(PDF) 5 Page - Motorola, Inc

Part No. SN74LS160A
Description  BCD DECADE COUNTERS/ 4-BIT BINARY COUNTERS
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Maker  MOTOROLA [Motorola, Inc]
Homepage  http://www.freescale.com
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5-5
FAST AND LS TTL DATA
SN54/74LS160A
• SN54/74LS161A
SN54/74LS162A
• SN54/74LS163A
AC SETUP REQUIREMENTS (TA = 25°C)
Sb l
P
Limits
Ui
T
C
di i
Symbol
Parameter
Min
Typ
Max
Unit
Test Conditions
tWCP
Clock Pulse Width Low
25
ns
V5 0 V
tW
MR or SR Pulse Width
20
ns
V5 0 V
ts
Setup Time, other*
20
ns
V5 0 V
ts
Setup Time PE or SR
25
ns
VCC = 5.0 V
th
Hold Time, data
3
ns
th
Hold Time, other
0
ns
trec
Recovery Time MR to CP
15
ns
*CEP, CET or DATA
DEFINITION OF TERMS
SETUP TIME (ts) — is defined as the minimum time required
for the correct logic level to be present at the logic input prior to
the clock transition from LOW to HIGH in order to be recog-
nized and transferred to the outputs.
HOLD TIME (th) — is defined as the minimum time following
the clock transition from LOW to HIGH that the logic level must
be maintained at the input in order to ensure continued recog-
nition. A negative HOLD TIME indicates that the correct logic
level may be released prior to the clock transition from LOW to
HIGH and still be recognized.
RECOVERY TIME (trec) — is defined as the minimum time re-
quired between the end of the reset pulse and the clock transi-
tion from LOW to HIGH in order to recognize and transfer
HIGH Data to the Q outputs.
AC WAVEFORMS
Figure 1. Clock to Output Delays, Count
Frequency, and Clock Pulse Width
Figure 2. Master Reset to Output Delay, Master Reset
Pulse Width, and Master Reset Recovery Time
1.3 V
1.3 V
1.3 V
1.3 V
1.3 V
1.3 V
1.3 V
CP
Q
tW(H)
tW(L)
trec
tPHL
tPHL
tPLH
OTHER CONDITIONS:
PE = MR (SR) = H
CEP = CET = H
OTHER CONDITIONS:
PE = L
P0 = P1 = P2 = P3 = H
tW
Q0 ⋅ Q1 ⋅ Q2 ⋅ Q3
MR
CP




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