MSM82C84A-2GS Ver la hoja de datos (PDF) - Oki Electric Industry

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MSM82C84A-2GS

CLOCK GENERATOR AND DRIVER

Oki Electric Industry 

¡ Semiconductor

MSM82C84A-2RS/GS/JS

EXAMPLE OF USE (CSYNC)

The MSM82C84A-2 1/3 frequency divider counter is unsettled when the power is switched

on. Therefore, the CSYNC pin has been included to synchronize CLK with another signal.

When CSYNC is at high level, both CLK and PCLK are high-level outputs. If CSYNC is then

switched to low level, CLK is output from the next input clock rising edge, and is divided

by 3.

If CSYNC has not been synchronized with the input clock, use the following circuit to

achieve the required synchronization

External Sychronizing

Signal

External Clock

Signal (EFI)

DQ

CK≠

DQ

CKØ

CSYNC

MSM

82C84A-2

EFI CLK

CLK

When an external clock EFI is used as the clock source

External Sychronizing

X1

Signal

 D Q

CK≠

DQ

CKØ

CSYNC

X2

MSM

82C84A-2

OSC F/C

CLK

CLK

When the crystal oscillator is used as the clock source

NOTES ON USE

The MSM82C84A-2 cannot be used if the MSM80C86A-10 or MSM80C88A-10 is used within the

range of 8 MHz < operating frequency £ 10 MHz.

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