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SN54-74LS168 Datasheet(PDF) 6 Page - ON Semiconductor

Part No. SN54-74LS168
Description  BCD DECADE/MODULO 16 BINARY SYNCHRONOUS BI-DIRECTIONAL COUNTERS
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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SN54-74LS168 Datasheet(HTML) 6 Page - ON Semiconductor

   
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FAST AND LS TTL DATA
SN54/74LS168
• SN54/74LS169
AC WAVEFORMS
Figure 1. Clock to Output Delays,
Count Frequency, and Clock Pulse Width
Figure 2. Count Enable Trickle Input
To Terminal Count Output Delays
Figure 3. Clock to Terminal Delays
Figure 4. Setup Time (ts) and Hold (th)
for Parallel Data Inputs
1.3 V
1.3 V
1.3 V
1.3 V
1.3 V
1.3 V
1.3 V
1.3 V
CP
Q OR TC
tPHL
tPLH
tPLH
tPHL
CET
TC
1/fmax
tW
1.3 V
1.3 V
1.3 V
1.3 V
1.3 V
1.3 V
1.3 V
1.3 V
ts(H)
ts(L)
th(L) = 0
th(H) = 0
Q0 • Q1 • Q2 • Q3
CP
TC
tPLH
tPHL
1.3 V
1.3 V
1.3 V
1.3 V
P0 • P1 • P2 • P3
1.3 V
1.3 V
1.3 V
1.3 V
1.3 V
1.3 V
1.3 V
1.3 V
1.3 V
SR OR PE
CP
U/D
TC
ts(L)
ts(H)
th(L) = 0
th(H) = 0
ts(H)
th(H) = 0
th(L) = 0
ts(H)
ts(L)
tPLH
tPHL
1.3 V
1.3 V
1.3 V
1.3 V
1.3 V
1.3 V
1.3 V
1.3 V
1.3 V
1.3 V
1.3 V
1.3 V
ts(L)
th(L) = 0
th(H) = 0
Figure 5. Setup Time and Hold Time for
Count Enable and Parallel Enable Inputs,
and Up-Down Control Inputs
Figure 6. Up-Down Input to
Terminal Count Output Delays
The shaded areas indicate when the
input is permitted to change for
predictable output performance.
CP
CEP
CET
CP


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