DS1631 Datasheet, PDF (10/19 Pages) National Semiconductor (TI) – CMOS Dual Peripheral Drivers

DS1244/DS1244P
PHANTOM CLOCK AC ELECTRICAL CHARACTERISTICS
Over the operating range (5V)
PARAMETER
Read Cycle Time
CE Access Time
OE Access Time
CE to Output Low-Z
OE to Output Low-Z
CE to Output High-Z
OE to Output High-Z
Read Recovery
Write Cycle Time
Write Pulse Width
Write Recovery
Data Setup Time
Data Hold Time
CE Pulse Width
RESET Pulse Width
SYMBOL
t_RC
t_CO
t_OE
t_COE
t_OEE
t_OD
t_ODO
t_RR
t_WC
t_WP
t_WR
t_DS
t_DH
t_CW
t_RST
MIN
65
5
5
10
65
55
10
30
0
60
65
TYP
MAX
55
55
25
25
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
NOTES
5
5
3
10
4
4
POWER-DOWN/POWER-UP TIMING
PARAMETER
CE at V_IH before Power-Down
V_CC Slew from V_PF(max) to
V_PF(min)( CE at V_PF)
V_CC Slew from V_PF(min) to V_SO
V_CC Slew from V_PF(max) to
V_PF(min)( CE at V_PF)
CE at V_IH after Power-Up
SYMBOL
t_PD
t_F
t_FB
t_R
t_REC
MIN
0
300
10
0
1.5
PARAMETER
Expected Data Retention Time
SYMBOL
t_DR
MIN
10
TYP
Over the operating range (5V)
MAX UNITS NOTES
ms
ms
ms
ms
2.5
ms
TYP
MAX
(T_A = +25°C)
UNITS NOTES
years
9
Warning: Under no circumstances are negative undershoots of any amplitude allowed when device is in
battery-backup mode.
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