87C51SL Datasheet (Intel) - KEYBOARD CONTROLLER

87C51SL, KEYBOARD CONTROLLER

Table 1 Pin Descriptions Symbol Type Description VSS Circuit ground potential VCC Supply voltage during normal Idle and Power-Down operation nominally a5V g10% for 8XC51SL a3 3V g 0 3V for Low Voltage 8XC51SL PCDB0 * 7 I O Host interface data bus An 8-bit bidirectional port for data

8XC51SL LOW VOLTAGE 8XC51SL KEYBOARD CONTROLLER 80C51SL CPU with RAM and I O VCC e 5V g10% 81C51SL 16K ROM Preprogrammed with SystemSoft Keyboard Controller and Scanner Firmware VCC e 5V g10% 83C51SL 16K Factory Programmed ROM VCC e 5V g10% 87C51SL 16K OTP ROM VCC e 5V g10% Low Voltage 80C51SL CPU with RAM and I O VCC e 3 3V g0 3V Low Voltage 81C51SL 16K ROM Preprogrammed with SystemSoft Keyboard Controller and Scanner Firmware VCC e 3 3V g0 3V Low Voltage 83C51SL 16K Factory Programmed ROM VCC

87C51SL Features

* I O PU P22 A10 I O PU P23 A11 I O PU P24 A12 I O PU P25 A13 I O PU P26 A14 I O PU P27 LED4 I O OD VSS GATEA20 O PCDB7 IO PCDB6 IO PCDB5 IO PCDB4 IO PCDB3 IO PCDB