SN74LV8154 Datasheet, PDF (6/11 Pages) Texas Instruments – DUAL 16 BIT BINARY COUNTERS WITH 3 STATE OUTPUT REGISTERS

SN74LV8154
DUAL 16ĆBIT BINARY COUNTERS
WITH 3ĆSTATE OUTPUT REGISTERS
SCLS589 − AUGUST 2004
timing requirements over recommended operating free-air temperature range, V_CC = 5 V ± 0.5 V
(unless otherwise noted) (see Figure 1)
tw Pulse duration
tsu Setup time
th
Hold time
tz† Z-period
† _{tz condition: CL = 50 pF, RL = 1 kΩ}
CLKA, CLKB, RCLK high or low
CCLR low
CLKBEN low before CLKB↑
CCLR high (inactive) before CLKA↑
or CLKB↑
CLKA↑ or CLKB↑ before RCLK↑
RCLK↑ before GAL or GAU or GBL or
GBU low
GAL or GAU or GBL or GBU high
(inactive) before RCLK↑
CLKBEN low after CLKB↑
CLKA or CLKB after RCLK
GAL, GAU, GBL, GBU all high before
one of them switches low
MIN MAX UNIT
10
ns
20
10
10
10
ns
10
10
0
ns
0
200
ns
switching characteristics over recommended operating free-air temperature range,
V_CC = 3.3 V ± 0.3 V (unless otherwise noted) (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
LOAD
CAPACITANCE
TA = 25°C
MIN TYP MAX
MIN MAX UNIT
fMAX
tpd
RCLK
CLKA
Y
RCOA
CL = 15 pF
CL = 50 pF
40
MHz
25
22
1
38
ns
26
1
44
tPLH
ten
CCLR
GAL, GAU, GBL, GBU
RCOA
Y
CL = 15 pF
18
1
32 ns
27
1
46 ns
tdis
GAL, GAU, GBL, GBU
Y
12
1
21 ns
RCLK
Y
tpd
CLKA
RCOA
25
1
42
ns
28
1
46
tPLH
ten
CCLR
GAL, GAU, GBL, GBU
RCOA
Y
CL = 50 pF
20
1
35 ns
30
1
50 ns
tdis
GAL, GAU, GBL, GBU
Y
14
1
24 ns
6
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