DS1744 Datasheet, PDF (8/18 Pages) Dallas Semiconductor – Y2K-Compliant, Nonvolatile Timekeeping RAMs

DS1744/DS1744P Y2K-Compliant, Nonvolatile Timekeeping RAMs
DC ELECTRICAL CHARACTERISTICS
(V_CC = 3.3V ±10%, T_A = Over the operating range.)
PARAMETER
SYMBOL MIN
Active Supply Current
TTL Standby Current
( CE = V_IH)
CMOS Standby Current
( CE ³ V_CC - 0.2V)
Input Leakage Current (Any
Input)
Output Leakage Current
(Any Output)
Output Logic 1 Voltage
(I_OUT = -1.0mA)
Output Logic 0 Voltage
(I_OUT = +2.1mA)
Write Protection Voltage
I_CC
I_CC1
I_CC2
I_IL
I_OL
V_OH
V_OL
V_PF
-1
-1
2.4
2.80
Battery Switchover Voltage
V_SO
TYP
V_BAT
or
V_PF
MAX UNITS NOTES
30
mA
2, 3
2
mA
2, 3
2
mA
2, 3
+1
mA
+1
mA
1
0.4
1
2.97
V
1
V
1, 4
AC CHARACTERISTICS—READ CYCLE (5V)
(V_CC = 5.0V ±10%, T_A = Over the operating range.)
PARAMETER
SYMBOL MIN
Read Cycle Time
Address Access Time
CE to DQ Low-Z
t_RC
70
t_AA
t_CEL
5
CE Access Time
t_CEA
CE Data Off Time
OE to DQ Low-Z
OE Access Time
t_CEZ
t_OEL
5
t_OEA
OE Data Off Time
t_OEZ
Output Hold from Address
t_OH
5
TYP
MAX
70
70
25
35
25
UNITS NOTES
ns
ns
ns
ns
ns
ns
ns
ns
ns
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