DS1556 Maxim, DS1556 Datasheet - Page 2

• Manufacturer Part Number: DS1556
• Description: The DS1556 is a full-function, year-2000-compliant (Y2KC), real-time clock/calendar (RTC) with an RTC alarm, watchdog timer, power-on reset, battery monitor, and 128k x 8 nonvolatile static RAM
• Manufacturer: Maxim

PIN DESCRIPTION
A0–A16
DQ0–DQ7
IRQ/FT
RST
CE
OE
WE
V
GND
N.C.
X1, X2
V
ORDERING INFORMATION
+Denotes a lead(Pb)-free/RoHS-compliant package.
*DS9034-PCX+ or DS9034I-PCX+ required (must be ordered separately).
**A “+” in top mark denotes a lead(Pb)-free device. An “IND” anywhere on the top mark indicates an industrial temperature grade device.
DS1556-70+
DS1556-70IND+
DS1556P-70+
DS1556P-70IND+
DS1556W-120+
DS1556W-120IND+
DS1556WP-120+
DS1556WP-120IND+
CC
BAT
PART
- Address Input
- Data Input/Outputs
- Chip Enable
- Output Enable
- Write Enable
- Power Supply Input
- Ground
- No Connection
- Crystal Connection
- Battery Connection
- Interrupt, Frequency Test Output (Open Drain)
- Power-On Reset Output (Open Drain)
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
VOLTAGE
(V)
5.0
5.0
5.0
5.0
3.3
3.3
3.3
3.3
2 of 18
DS1556 1M, Nonvolatile, Y2K-Compliant Timekeeping RAM
PIN-PACKAGE
32 EDIP (0.740a)
32 EDIP (0.740a)
34 PowerCap*
34 PowerCap*
32 EDIP (0.740a)
32 EDIP (0.740a)
34 PowerCap*
34 PowerCap*
TOP MARK**
DS1556+070
DS1556+070 IND
DS1556P+70
DS1556P+70 IND
DS1556W+120
DS1556W+120 IND
DS1556WP+120
DS1556WP+120 IND