Z86319 Datasheet, PDF (1/23 Pages) Zilog, Inc. – PS/2 MOUSE CONTROLLER

PRELIMINARY PRODUCT SPECIFICATION
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Z86319
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PS/2 MOUSE CONTROLLER
FEATURES
Device
ROM
(KB)
RAM* I/O
(Bytes) Lines
Z86319
2
125
13
Note: *General-Purpose (144K Total RAM)
Voltage
Range
4.5V to 5.5V
s 0°C to + 40°C Operating Temperature Range
s Low-Power Consumption: 25 mW (Typical)
s P24-P27 Can Be Configured with a Voltage Divider
During Input Mode
s On-Chip Oscillator (Tolerance = ±10%)
s Fast Instruction Pointer: 1.5 µs @ 4 MHz
s ESD Protection Circuitry
s Hardwired Watch-Dog Timer (WDT)
s Excellent System Level EMI/EFT/ESD
GENERAL DESCRIPTION
The Z86319 is a member of the Z8 family of CMOS micro-
controllers architecture to be used in mouse applications.
These devices offer on-board pull-up and pull-down resis-
tors, a trip-point buffer to accommodate opto-transistor
outputs, and high drive ports capable of up to 10 mA cur-
rent sinking per pin (3 pins maximum).
A permanently enabled Watch-Dog Timer ensures opera-
tional reliability across a broad range of mouse application
environments. The precision RC oscillator filters out high-
frequency noise from the oscillator input pin. When config-
ured as inputs, P24-P27 have built in voltage dividers (25K
pull-up /7.5K pull-down). The input levels are designed for
connection to the emitters of the opto-transistors and
switch at a voltage level of 0.4 V_DD.
For applications requiring powerful I/O capabilities, the
Z86319 provides dedicated input and output lines that are
grouped into three ports. There are two basic address
spaces available to support this configuration: Program
Memory, and 125 bytes of general-purpose registers.
The Z86319 device provides two on-chip 8-bit programma-
ble counter/timers with a large number of user-selectable
modes. Each counter/timer is driven by its own 6-bit pro-
grammable prescaler. The Z86319 counter/timers off-load
system real-time tasks such as counting/timing and in-
put/output data communications for increased system effi-
ciency.
DS97KEY1605
PRELIMINARY
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