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Text: NEC //PD4990A S E R IA L I/O C A L E N D A R & C LO C K C M O S LS I DESCRIPTION The ¿xPD4990AC, ¿tPD4990AG are a CMOS LS I c h ip developed to in p u t/o u tp u t calendar c lo c k deta seri a lly t o /f r o m th e m icro com puter. The crystal frequency is 3 2 .7 6 8 kH z and the data item s included are a bo ut tim e , m in u te , second, year, m o n th
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uPD4990A
xPD4990AC,
tPD4990AG
PD4990AC)
/1PD4990AG
PD499QA
juPD4990A
14PIN
-100-300A
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