Z86L70 Datasheet, PDF (50/61 Pages) Zilog, Inc. – IR/Low-Voltage Microcontroller

Z86L70/71/75/C71
IR/Low-Voltage Microcontroller
Zilog
FUNCTIONAL DESCRIPTION (Continued)
Low Voltage Detection/Protection. An on-chip Voltage
Comparator checks that the V_CC is at the required level for
correct operation of the device. Reset is globally driven
when V_CC falls below V_LV (Vrf1).
Mask Selectable Options. There are six Mask Selectable
Options to choose from based on ROM code require-
ments.
Permanent Watch-Dog
Timer
RAM Protect
ROM Protect
32 kHz XTAL
Port 00-07 Pull-ups
Port 31-33 Pull-ups
Port 20-27 Pull-ups
On/WDT command invoked
On/Off
On/Off
On/Off
On/Off
On/Off
On/Off
Note: Internal Port 0/Pull-Up resistors remain connected
when port pins are configured as outputs.
The Low Voltage trip voltage (V_LV) is less than 2.1V under
the following conditions:
Maximum (V_LV) Conditions:
T_A = 0°C, +55°C Internal clock frequency equal to or less
than 4.0 MHz
Note: The internal clock frequency is one-half the external
clock frequency.
The device is guaranteed to function normally until the Low
Voltage Protection trip point V_LV is reached, below which
reset is globally driven. The device is guaranteed to func-
tion normally at supply voltages above the V_LV trip point for
the temperatures and operating frequencies in maximum
V_LV conditions. The actual V_LV trip point is a function of
temperature and process parameters (Figure 39).
1.8
1.6
1.4
VLV
1.2
1
0.8
0.6
0.4
0.2
0
0
15 25 35
45
55
Temperature
Figure 39. Typical Z86L7X Low Voltage vs
Temperature at 8 MHz
1-50
PRELIMINARY
DS97LVO0500