Datasheet

SN54ALS161B, SN54ALS162B, SN54ALS163B, SN54AS161, SN54AS163
SN74ALS161B, SN74ALS163B, SN74AS161, SN74AS163
SYNCHRONOUS 4-BIT DECADE AND BINARY COUNTERS
SDAS276A – DECEMBER 1994 – REVISED JULY 2000
10
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
timing requirements over recommended operating conditions (see Figure 1)
SN54AS161
SN54AS163
SN74AS161
SN74AS163
UNIT
MIN MAX MIN MAX
f
clock
Clock frequency 65 75 MHz
t
Pulse duration
CLR high or low 7.7 6.7
ns
t
w
P
u
lse
d
u
ration
’AS161 CLR low 10 8
ns
↑
A, B, C, D 10 8
↑
LOAD 10 8
t
Setu
p
time before CLK↑
ENP, ENT 10 8
ns
t
su
Set
u
p
time
,
before
CLK↑
’AS161 CLR inactive 10 8
ns
’
AS163
CLR low 14 12
’AS163
CLR high (inactive) 10 9
t
h
Hold time, all synchronous inputs after CLK↑ 2 0 ns
switching characteristics over recommended operating conditions (see Figure 1)
PARAMETER
FROM TO
SN54AS161 SN74AS161
UNIT
PARAMETER
(INPUT) (OUTPUT)
MIN MAX MIN MAX
UNIT
f
max
65* 75 MHz
t
PLH
CLK
RCO (with LOAD high) 1 8.5 1 8
ns
t
PLH
CLK
RCO (with LOAD low) 3 17.5 3 16.5
ns
t
PHL
CLK RCO 2 14 2 12.5 ns
t
PLH
CLK
Any Q
1 7.5 1 7
ns
t
PHL
CLK
An
y
Q
2 14 2 13
ns
t
PLH
ENT
RCO
1.5 10 1.5 9
ns
t
PHL
ENT
RCO
1 9.5 1 8.5
ns
t
PHL
CLR
Any Q 2 14 2 13
ns
t
PHL
CLR
RCO 2 14 2 12.5
ns
* On products compliant to MIL-PRF-38535, this parameter is not production tested.
switching characteristics over recommended operating conditions (see Figure 1)
PARAMETER
FROM TO
SN54AS163 SN74AS163
UNIT
PARAMETER
(INPUT) (OUTPUT)
MIN MAX MIN MAX
UNIT
f
max
65* 75 MHz
t
PLH
CLK
RCO (with LOAD high) 1 8.5 1 8
ns
t
PLH
CLK
RCO (with LOAD low) 3 17.5 3 16.5
ns
t
PHL
CLK RCO 2 14 2 12.5 ns
t
PLH
CLK
Any Q
1 7.5 1 7
ns
t
PHL
CLK
An
y
Q
2 14 2 13
ns
t
PLH
ENT
RCO
1.5 10 1.5 9
ns
t
PHL
ENT
RCO
1 9.5 1 8.5
ns
* On products compliant to MIL-PRF-38535, this parameter is not production tested.