L8708H datasheet(54/66 Pages) ZILOG

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Z86L88/81/86/87/89/73

IR/Low-Voltage Microcontroller

P R E L I M I N A R Y

DS96LV00800

Mask Selectable Options. There are seven Mask Select-

able Options to choose from based on ROM code require-

ments. These are:

Low Voltage Detection/Standby. An on-chip Voltage

Comparator checks that the VCC is at the required level for

correct operation of the device. Reset is globally driven

when VCC falls below VLV (Vrf1). A small further drop in

VCC causes the XTAL1 and XTAL2 circuitry to stop the

crystal or resonator clock. Typical Low-Voltage power con-

sumpion in this Low Voltage Standby mode (ILV) is about

µA (varying with the number of Mask selectable options

enabled). If the VCC is allowed to stay above Vram, the

RAM content is preserved. When the power level is re-

turned to above VLV, the device will perform a POR and

function normally (Figure 45).

The minimum operating voltage varies with the tempera-

ture and operating frequency, while VLV varies with tem-

perature only.

The Low Voltage trip voltage (VLV) is less than 2.1V under

the following conditions:

Maximum (VLV) Conditions:

TA = 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.

RAM Protect

On/Off

RC/Other

RC/XTAL

32 kHz XTAL

On/Off

Port 04-07 Pull-Ups

On/Off

Port 00-03 Pull-Ups

On/Off

Port 20-27 Pull-Ups

On/Of

Port 30-33 Pull-Ups

On/Of

Port 3 Mouse Mode 0.4 VDD

Trip

On/Off

Figure 45. Typical Z86LXX Low Voltage vs

Temperature at 8 MHZ

1.8

1.6

1.4

1.2

1.8

0.6

0.4

0.2

VLV

Temperature

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