M48T212A View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

M48T212A

3.3V TIMEKEEPER® CONTROLLER

STMicroelectronics 

M48T212A

Figure 3. Hardware Hookup

A0-A18

3.3V

0.1µF

1N5817 (1)

SuperCap Supply

A0-A3

VCC

VCCSW

MOTOROLA

MTD20P06HDL

A0-Axx

A

VOUT

E

M48T212A

EX

0.1µF

W

E1CON

G

Note 2

E2CON

WDI

RSTIN1

RSTIN2

RST

DQ0-DQ7 IRQ/FT

VCAP

X0

VSS

32 kHz

Crystal

XI

VCC

CMOS

SRAM

E

A0-Axx

VCC

CMOS

SRAM

E

AI03049

Note: 1. See description in Power Supply Decoupling and Undershoot Protection.

2. Traces connecting E1CON and E2CON to external SRAM should be as short as possible.

Figure 4. AC Testing Load Circuit (3,4)

Table 5. AC Measurement Conditions

Input Rise and Fall Times

≤ 5ns

DEVICE

UNDER

TEST

645Ω

Input Pulse Voltages

0 to 3V

Input and Output Timing Ref. Voltages

1.5V

Note that Output Hi-Z is defined as the point where data

is no longer driven.

CL = 100pF or 5pF (1)

CL = 30 pF (2)

1.75V

CL includes JIG capacitance

Note: 1. DQ0-DQ7

2. E1CON and E2CON

3. Excluding open-drain output pins

4/20

AI03239

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