P
RELIMINARY
P
RODUCT
S
PECIFICATION
1
Z86319
PS/2 M
OUSE
C
ONTROLLER
FEATURES
Device
Z86319
ROM
(KB)
2
RAM*
(Bytes)
125
I/O
Lines
13
Voltage
Range
4.5V to 5.5V
s
1
P24-P27 Can Be Configured with a Voltage Divider
During Input Mode
On-Chip Oscillator (Tolerance =
±
10%)
Fast Instruction Pointer: 1.5
µ
s @ 4 MHz
ESD Protection Circuitry
Hardwired Watch-Dog Timer (WDT)
Excellent System Level EMI/EFT/ESD
s
s
Note:
*General-Purpose (144K Total RAM)
s
s
0
°
C to + 40
°
C Operating Temperature Range
Low-Power Consumption: 25 mW (Typical)
s
s
s
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
1
Z86319
PS/2 Mouse Controller
Zilog
PIN FUNCTIONS
RCIN.
A precision 1% resistor is connected to RCIN,
generating oscillation with an internal capacitor.
Resistor values and corresponding typical frequencies are
shown in Table 2 and graph chart (Figure 3).
Table 2. Resistor Values and Corresponding
Typical Frequencies
External Resistor
14.0K
15.0K
16.0K
17.0K
18.0K
19.0K
20.0K
21.0K
22.0K
23.0K
Average Frequency
5.01 MHz
4.70 MHz
4.43 MHz
4.19 MHz
3.97 MHz
3.78 MHz
3.60 MHz
3.44 MHz
3.30 MHz
3.16 MHz
6
5
FREQUENCY (MHz)
4
3
2
1
0
14
15
16
17
18
19
20
21
22
23
RESISTOR VALUE (K OHMS)
Figure 3. Z86319 RC Frequency in Function of the External Resistance
(typical numbers)
4
PRELIMINARY
DS97KEY1605
Zilog
Z86319
PS/2 Mouse Controller
STANDARD TEST CONDITIONS
The characteristics listed below apply for standard test
conditions as noted. All voltages are referenced to
Ground. Positive current flows into the referenced pin
(Figure 4).
From Output
Under Test
1
I
150 pF
Figure 4. Test Load Diagram
ABSOLUTE MAXIMUM RATINGS
Sym
V
DD
T
STG
T
A
Parameter
Supply Voltage*
Storage Temp
Oper Ambient
Temp
Min
–0.3
–65
°
0
°
Max
+7
+150
°
40
°
Units
V
C
C
Stresses greater than those listed under Absolute Maxi-
mum Ratings may cause permanent damage to the device.
This rating is a stress rating only; operation of the device
at any condition above those indicated in the operational
sections of these specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods
may affect device reliability.
Notes:
*Voltages on all pins with respect to Ground.
CAPACITANCE
T
A
= GND = 0V, f = 1.0 MHz, unmeasured pins returned to Ground.
Parameter
Input Capacitance
Output Capacitance
I/O Capacitance
Min
0
0
0
Max
10 pF
20 pF
25 pF
V
CC
SPECIFICATION
V
CC
= 4.5V to 5.5V
Using the precision RC oscillator feature, f = 4.0 MHz
±
10% under the following conditions:
s
s
s
V
CC
= 5.0V
±
10%
Temp 0 to 40
°
C
Application board capacitance:
– 2.0 pF max.
– 0.5 pF min.
DS97KEY1605
PRELIMINARY
5
Embedded System
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