SST89E54RD2A(2011) View Datasheet(PDF) - Silicon Storage Technology

Part Name

Description

View to exact match

SST89E54RD2A
(Rev.:2011)

FlashFlex MCU

Silicon Storage Technology 

A Microchip Technology Company

FlashFlex MCU

SST89E54RD2A/RDA / SST89E58RD2A/RDA

Not Recommended for New Designs

Table 1: Pin Descriptions (Continued) (3 of 3)

Symbol

Type1

Name and Functions

XTAL1

I

Crystal 1: Input to the inverting oscillator amplifier and input to the internal

clock generator circuits.

XTAL2

O

Crystal 2: Output from the inverting oscillator amplifier

VDD

I

Power Supply

VSS

I

Ground

T0-0.0 25114

1. I = Input; O = Output

2.ALE loading issue: When ALE pin experiences higher loading (>30pf) during the reset, the MCU may accidentally enter

into modes other than normal working mode. The solution is to add a pull-up resistor of 3-50 K to VDD, e.g. for ALE pin.

3. For 6 clock mode, ALE is emitted at 1/3 of crystal frequency.

4. Port 4 is not present on the PDIP package.

©2011 Silicon Storage Technology, Inc.

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DS25114A

12/11

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