M48T35-70MH1E STMICROELECTRONICS [STMicroelectronics], M48T35-70MH1E Datasheet - Page 4

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M48T35-70MH1E

Manufacturer Part Number
M48T35-70MH1E
Description
5V, 256 Kbit (32 Kb x 8) TIMEKEEPER SRAM
Manufacturer
STMICROELECTRONICS [STMicroelectronics]
Datasheet
List of figures
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Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
DIP connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
SOIC connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Read mode AC waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Write enable controlled, write AC waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Chip enable controlled, write AC waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Crystal accuracy across temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Clock calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Supply voltage protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
AC measurement load circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Power down/up mode AC waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
PCDIP28 – 28-pin plastic DIP, battery CAPHAT, package outline . . . . . . . . . . . . . . . . . . . 21
SOH28 – 28-lead plastic small outline, 4-socket battery SNAPHAT, package outline . . . . 22
SH – 4-pin SNAPHAT housing for 48mAh battery & crystal, package outline . . . . . . . . . . 23
SH – 4-pin SNAPHAT housing for 120mAh battery & crystal, package outline . . . . . . . . . 24
PMDIP28 – 28-pin plastic DIP, hybrid, package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

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