Rainbow Electronics DS1254 - Manual

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FEATURES
§ Real-time clock (RTC) keeps track of hundredths
of seconds, seconds, minutes, hours, days, date,
months, and years with automatic leap- year
compensation valid up to the year 2100
§ 2M x 8 NV SRAM
§ Watch function is transparent to RAM operation
§ Automatic data protection during power loss
§ Unlimited write-cycle endurance
§ Surface-mountable BGA module construction
§ Over 10 years of data retention in the absence of
power
§ Battery monitor checks remaining capacity daily
§ +3.3V or +5V operation
PACKAGE OUTLINE
ORDERING INFORMATION
PART DESCRIPTION
DS1254X 2M x 8 NV SRAM with Phantom Clock
W +3.3V operation
Y +5.0V operation
PIN DESCRIPTION
V
CC
- Supply Voltage
A0–A20 - Address Inputs
DQ0–DQ7 - Data I/O
CE - Chip Enable Input
OE - Output Enable Input
WE - Write Enable Input
BW - Battery Warning Output (Open Drain)
GND - Ground
Side -A - Shown
(For Reference Only, Not to Scale)
BGA Module Base
Bottom View
DS1254
2M x 8 NV SRAM with
Phantom Clock
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