NSC DP8228N, DP8228MJ-MIL Datasheet

TL/F/6825

DP8228/DP8228M/DP8238/DP8238M System Controller and Bus Driver

December 1988

DP8228/DP8228M/DP8238/DP8238M
System Controller and Bus Driver

General Description

The DP8228/DP8228M, DP8238/DP8238M are system
controller/bus drivers contained in a standard, 28-pin dual­in-line package. The chip, which is fabricated using Schottky
Bipolar technology, generates all the read and write control
signals required to directly interface the memory and input/
output components of the 8080A microcomputer family. The
chip also provides drive and isolation for the bidirectional
data bus of the 8080A microprocessor. Data bus isolation
enables the use of slower memory and input/output compo­nents in a system, and provides for enhanced system noise
immunity.

A user-selected signal-level interrupt vector (RST 7) is pro­vided by the device for use in the interrupt structure of small
systems that need only one basic vector. No additional
components (such as an interrupt instruction port) are re­quired to use the single interrupt vector in these systems.
The devices also generate an Interrupt Acknowledge (INTA

)

control signal for each byte of a multibyte CALL instruction

when an interrupt is acknowledged by the 8080A. This fea­ture permits the use of a multilevel priority interrupt structure
in large, interrupt-driven systems.

Features

Y

Single chip system controller and bus driver for 8080A
Microcomputer Systems

Y

Allows use of multibyte CALL instructions for Interrupt
Acknowledge

Y

Provides user-selected single-level interrupt vector
(RST 7)

Y

Provides isolation of data bus

Y

Supports a wide variety of system bus structures

Y

Reduces system component count

Y

DP8238/DP8238M provides advanced Input/Output
Write and Memory Write control signals for large sys­tem timing control

8080A Microcomputer Family Block Diagram

TL/F/6825– 1

TRI-STATEÉis a registered trademark of National Semiconductor Corporation.

C

1995 National Semiconductor Corporation RRD-B30M105/Printed in U. S. A.

Absolute Maximum Ratings

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.

Storage Temperature

b

65§Ctoa150§C

Supply Voltage, V

CC

b

0.5 toa7V

Input Voltage

b

1.5V toa7V

Output Current 100 mA

Maximum Power Dissipation* at 25§C

Cavity Package 2179 mW

Molded Package 2361 mW

*Derate cavity package 14.5 mW/§C above 25§C; derate molded package

18.9 mW/

§

C above 25§C.

Operating Conditions

Min Max Units

Supply Voltage (V

CC

)

DP8228M, DP8238M 4.50 5.50 V

DC

DP8228, DP8238 4.75 5.25 V

DC

Operating Temperature (TA)

DP8228M, DP8238M

b

55

a

125

§

C

DP8228, DP8238 0

a

70

§

C

Note:

Maximum ratings indicate limits beyond which perma­nent damage may occur. Continuous operation at these lim­its is not intended and should be limited to those conditions
specified under DC electrical characteristics.

Electrical Characteristics Min

s

T

A

s

Max, MinsV

CC

s

Max, unless otherwise noted

Symbol Parameter Conditions Min

Typ

Max Units

(Note 1)

V

C

Input Clamp Voltage, All Inputs V

CC

e

Min, I

C

eb

5 mA 0.6

b

1.0 V

I

F

Input Load STSTB V

CC

e

Max 500 mA

Current

D2 and D6

V

F

e

0.45V for DP8228, DP8238
750 mA

D0, D1, D4,

V

F

e

0.40V for DP8228M, DP8238M

250 mA

D5 and D7

All Other

250 mA

Inputs

I

R

Input Leakage DB0–DB7 V

CC

e

Max, V

R

e

V

CC

20 mA

Current

All Other

100 mA

Inputs

V

TH

Input Threshold Voltage, V

CC

e

5V

0.8 2.0 V

All Inputs

I

CC

Power Supply Current V

CC

e

Max DP8228, DP8238 185 230 mA

DP8228M, DP8238M 160 230 mA

V

OL

Output Low D0–D7 V

CC

e

Min, DP8228M, DP8238M 0.50 V

Voltage I

OL

e

2mA

DP8228, DP8238 0.45 V

All Other V

CC

e

Min, DP8228M, DP8238M 0.50 V

Outputs I

OL

e

10 mA

DP8228, DP8238 0.45 V

V

OH

Output High D0– D7 V

C

e

Min, DP8228M, DP8238M 3.3 3.8 V

I

OL

eb

10 mA

DP8228, DP8238 3.6 3.8 V

All Other V

CC

e

Min, I

OH

eb

1mA

2.4 3.8 V

Outputs

I

OS

Short Circuit Current, All Outputs V

CC

e

5V, V

O

e

0V 15 90 mA

I

O (OFF)

OFF State Output Current V

CC

e

Max, V

O

e

V

CC

100 mA

All Control Outputs

V

CC

e

Max, V

O

e

0.45V

b

100 mA

I

INT

INTA Current (See Test Conditions,

Figure 3

)5mA

Note 1: Typical values are for T

A

e

25§C and typical supply voltages.

2