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SN54LS168 Datasheet(PDF) 6 Page - Motorola, Inc

Part No. SN54LS168
Description  BCD DECADE/MODULO 16 BINARY SYNCHRONOUS BI-DIRECTIONAL COUNTERS
Download  8 Pages
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Manufacturer  MOTOROLA [Motorola, Inc]
Direct Link  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

SN54LS168 Datasheet(HTML) 6 Page - Motorola, Inc

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5-307
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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