Datasheet
SCHS353 − JANUARY 2004
7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
timing requirements over recommended operating free-air temperature range (unless otherwise
noted)
V
CC
T
A
= 25°C
T
A
= -55°C TO
125°C
T
A
= -40°C TO
85°C
UNIT
V
CC
MIN MAX MIN MAX MIN MAX
UNIT
2 V 6 4.2 5
f
clock
Clock frequency
4.5 V
31 21 25
MHz
f
clock
Clock frequency
6 V 36 25 29
MHz
2 V 80 120 100
SRCLK or RCLK high or low
4.5 V 16 24 20
t
w
Pulse duration
SRCLK or RCLK high or low
6 V 14 20 17
ns
t
w
Pulse duration
2 V 80 120 100
ns
SRCLR low
4.5 V 16 24 20
SRCLR low
6 V 14 20 17
2 V 100 150 125
SER before SRCLK↑
4.5 V 20 30 25
SER before SRCLK↑
6 V 17 25 21
2 V 75 113 94
SRCLK↑ before RCLK↑
†
4.5 V 15 23 19
t
su
Setup time
SRCLK↑ before RCLK↑
†
6 V 13 19 16
ns
t
su
Setup time
2 V 50 75 65
ns
SRCLR low before RCLK↑
4.5 V 10 15 13
SRCLR low before RCLK↑
6 V 9 13 11
2 V 50 75 60
SRCLR high (inactive) before SRCLK↑
4.5 V 10 15 12
SRCLR high (inactive) before SRCLK↑
6 V 9 13 11
2 V 0 0 0
t
h
Hold time, SER after SRCLK↑
4.5 V
0 0 0
ns
t
h
Hold time, SER after SRCLK
6 V 0 0 0
ns
†
This setup time allows the storage register to receive stable data from the shift register. The clocks can be tied together, in which case the shift
register is one clock pulse ahead of the storage register.