4-6

Functional Diagram

Absolute Maximum Ratings

Thermal Information

CDP1851 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5 to+11V

CDP1851C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.5 to +7V

DC Input Current, Any One Input

. . . . . . . . . . . . . . . . . . . . . . . . .±10mA

Device Dissipation Per Output Transistor

(All Package Type) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40mW

Thermal Resistance (Typical, Note 1)

θ

θ

PDIP Package . . . . . . . . . . . . . . . . . . .

50

N/A

SBDIP Package . . . . . . . . . . . . . . . . . .

36

12

Maximum Lead Temperature (During Soldering)

At Distance 1/16

± 1/32 inch (1.59 ± 0.79mm)

CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation

of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.

NOTE:

1.

θ

Operating Conditions

Selected so that Operation is Always within the Following Ranges:

PARAMETER

LIMITS

UNITS

CDP1851

CDP1851C

MIN

MAX

MIN

MAX

DC Operating Voltage Range

4

10.5

4

6.5

V

Input Voltage Range

V

MODE

CONTROL

AND

STATUS

REGISTERS

B0

B1

B2

B3

B4

B5

B6

B7

READY

STROBE

SECTION

B

A0

A1

A2

A3

A4

A5

A6

A7

READY

STROBE

SECTION

A

CLOCK

CS

RA0

RA1

WR/RD

RD/WR

TPB

CLEAR

ADDRESS

DECODE

AND

READ/

WRITE

LOGIC

A INT

B INT

INTERRUPT

MASKING

AND

LOGIC

DATA

BUS

BUFFER

DATA

BUS

FIGURE 1. FUNCTIONAL DIAGRAM FOR CDP1851 AND CDP1851C

CDP1851, CDP1851C