Rainbow Electronics DS1500 - Manual (Page 3)

DS1500 Y2KC Watchdog RTC with Nonvolatile Control
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DC ELECTRICAL CHARACTERISTICS
(V
CC
= 0V, T
A
= -40°C to +85°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Battery Current, BB32 = 0, EOSC = 0 I
BAT1
(Notes 8, 9) 0.27 1.0 µA
Battery Current, BB32 = 0, EOSC = 1 I
BAT2
(Notes 8, 9) 0.01 0.1 µA
V
BAUX
Current BB32 = 1, SQW Open I
BAUX
(Notes 8, 9) 2 µA
CRYSTAL SPECIFICATIONS*
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Nominal Frequency f
O
32.768 kHz
Series Resistance ESR 45 kΩ
Load Capacitance C
L
6 pF
*The crystal, traces, and crystal input pins should be isolated from RF generating signals. Refer to Application Note 58: Crystal Considerations
for Dallas Real-Time Clocks for additional specifications.
AC OPERATING CHARACTERISTICS
(V
CCI
= 5.0V ±10%, T
A
= -40°C to +85°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Read Cycle Time t
RC
70 ns
Address Access Time t
AA
70 ns
CS to DQ Low-Z t
CSL
(Note 10) 5 ns
CS Access Time t
CSA
70 ns
CS Data Off Time t
CSZ
(Note 10) 25 ns
OE to DQ Low-Z (0°C to +85°C) t
OEL
(Note 10) 5 ns
OE to DQ Low-Z (-40°C to 0°C) t
OEL
(Note 10) 2 ns
OE Access Time t
OEA
35 ns
OE Data Off Time t
OEZ
(Note 10) 25 ns
Output Hold from Address t
OH
5 ns
Write Cycle Time t
WC
70 ns
Address Setup Time t
AS
0 ns
WE Pulse Width t
WEW
50 ns
CS Pulse Width t
CSW
55 ns
Data Setup Time t
DS
30 ns
Data Hold Time t
DH
5 ns
Address Hold Time t
AH
0 ns
WE Data Off Time t
WEZ
(Note 10) 25 ns
Write Recovery Time t
WR
15 ns
CEI to CEO Propagation Delay t
CEPD
10 ns
Pulse Width, OE, WE, or CS High PW
HIGH
20 ns
Pulse Width, OE, WE, or CS Low PW
LOW
70 ns