LP87C51-2 查看數據表（PDF） - Intel

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LP87C51-2

CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER

Intel 

87C51 80C51BH 80C31BH

ONCE MODE

The ONCE (‘‘On-Circuit Emulation’’) mode facilitates

testing and debugging of systems using the

87C51 BH without the 87C51 BH having to be re-

moved from the circuit The ONCE mode is invoked

by

1 Pull ALE low while the device is in reset and

PSEN is high

2 Hold ALE low as RST is deactivated

While the device is in ONCE mode the Port 0 pins

float and the other port pins and ALE and PSEN are

weakly pulled high The oscillator circuit remains ac-

tive While the 87C51 BH is in this mode an emula-

tor or test CPU can be used to drive the circuit Nor-

mal operation is restored when a normal reset is ap-

plied

87C51 BH EXPRESS

The Intel EXPRESS system offers enhancements to

the operational specifications of the MCS-51 family

of microcontrollers These EXPRESS products are

designed to meet the needs of those applications

whose operating requirements exceed commercial

temperature

The EXPRESS program includes the commercial

standard temperature range with burn-in and an ex-

tended temperature range with or without burn-in

With the commercial standard temperature range

operational characteristics are guaranteed over the

temperature range of 0 C to 70 C With the extend-

ed temperature range option operational character-

istics are guaranteed over the range of b40 C to

a85 C

The optional burn-in is dynamic for a minimum time

of 160 hours at 125 C with VCC e 6 9V g0 25V

following guidelines in MIL-STD-883 Method 1015

Package types and EXPRESS versions are identified

by a one- or two-letter prefix to the part number The

prefixes are listed in Table 3

For the extended temperature range option this

data sheet specifies the parameters which deviate

from their commercial temperature range limits

Table 3 Prefix Identification

Prefix

Package

Type

Temperature

Range

Burn-in

P

Plastic

Commercial

No

D

Cerdip

Commercial

No

N

PLCC

Commercial

No

S

QFP

Commercial

No

TP

Plastic

Extended

No

TD

Cerdip

Extended

No

TN

PLCC

Extended

No

TS

QFP

Extended

No

LP

Plastic

Extended

Yes

LD

Cerdip

Extended

Yes

LN

PLCC

Extended

Yes

NOTE

Contact distributor or local sales office to match EXPRESS

prefix to proper device

Examples

P87C51 indicates 87C51 in a plastic package and

specified for commercial temperature range without

burn-in

LD87C51 indicates 87C51 in a cerdip package and

specified for extended temperature range with burn-

in

7

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