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Intersil Electronic Components Datasheet

CDP1851 Datasheet

CMOS Programmable I/O Interface

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CDP1851,
CDP1851C
March 1997
CMOS Programmable I/O Interface
Features
• 20 Programmable I/O Lines
• Programmable for Operation in Four Modes:
- Input
- Output
- Bidirectional
- Bit-programmable
• Operates in Either I/O or Memory Space
Ordering Information
PACKAGE TEMP. RANGE
5V
PKG.
10V NO.
PDIP
-40oC to +85oC CDP1851CE CDP1851E E40.6
Burn-In
CDP1851CEX - E40.6
SBDIP
-40oC to +85oC CDP1851CD
- D40.6
Burn-In
CDP1851CDX CDP1851DX D40.6
Description
THE CDP1851 and CDP1851C are CMOS programmable two-
port I/Os designed for use as general-purpose I/O devices.
They are directly compatible with CDP1800-series micropro-
cessors functioning at maximum clock frequency. Each port
can be programmed in either byte-I/O or bit-programmable
modes for interfacing with peripheral devices such as printers
and keyboards.
Both ports A and B can be separately programmed to be 8-bit
input or output ports with handshaking control lines, RDY and
STROBE. Only port A can be programmed to be a bidirectional
port. This configuration provides a means for communicating
with a peripheral device or microprocessor system on a single
8-bit bus for both transmitting and receiving data. Handshaking
signals are provided to maintain proper bus access control.
Port A handshaking lines are used for input control and port B
handshaking lines are used for output; therefore port B must be
in the bit-programmable mode where handshaking is not used.
Ports A and B can be separately bit programmed so that each
individual line can be designated as an input or output line. The
handshaking lines may also be individually programmed as
input or output when port A is not in bidirectional mode.
The CDP1851 has a supply-voltage range of 4V to 10.5V, and
the CDP1851C has a range of 4V to 6.5V. Both types are sup-
plied in 40-lead dual-in-line plastic (E suffix) or hermetic
ceramic (D suffix) packages. The CDP1851C is also available
in chip form (H suffix).
Pinout
CDP1851, CDP1851C
(PDIP, SBDIP)
TOP VIEW
CLOCK 1
CS 2
RA0 3
RA1 4
BUS0 5
BUS1 6
BUS2 7
BUS3 8
BUS4 9
BUS5 10
BUS6 11
BUS7 12
CLEAR 13
A INT 14
B INT 15
B RDY 16
B
STROBE
17
B0 18
B1 19
VSS 20
40 VDD
39 RD/WE
38 WR/RE
37 TPB
36 A RDY
35
A
STROBE
34 A0
33 A1
32 A2
31 A3
30 A4
29 A5
28 A6
27 A7
26 B7
25 B6
24 B5
23 B4
22 B3
21 B2
CDP1851 Programming Modes
MODE
(8)
PORT A
DATA PINS
(2)
PORT A
HANDSHAKING
PINS
Input
Accept Input
Data
READY, STROBE
Output
Output Data
READY, STROBE
Bidirectional Transfer In-
Input Handshaking
(Port A Only) put/Output Data for Port A
Bit-Program- Programmed In- Programmed Individ-
mable
dividually as In- ually as Inputs or
puts or Outputs Outputs
(8)
PORT B
DATA PINS
(2)
PORT B
HANDSHAKING
PINS
Accept Input Data READY, STROBE
Output Data
READY, STROBE
Must be Previous- Output Handshaking
ly Set to Bit-Pro- for Port A
grammable Mode
Programmed Indi- Programmed Individ-
vidually as Inputs ually as Inputs or
or Outputs
Outputs
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
http://www.intersil.com or 407-727-9207 | Copyright © Intersil Corporation 1999
4-5
File Number 1056.2


Intersil Electronic Components Datasheet

CDP1851 Datasheet

CMOS Programmable I/O Interface

No Preview Available !

CDP1851, CDP1851C
Absolute Maximum Ratings
Thermal Information
DC Supply-Voltage Range, (VDD)
(Voltage Referenced to VSS Terminal)
CDP1851 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5 to+11V
CDP1851C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.5 to +7V
Input Voltage Range, All Inputs . . . . . . . . . . . . . . -0.5 to VDD +0.5V
DC Input Current, Any One Input. . . . . . . . . . . . . . . . . . . . . . . . .±10mA
Device Dissipation Per Output Transistor
For TA = Full Package-Temperature Range
(All Package Type) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40mW
Operating-Temperature Range (TA)
Package Type D, H . . . . . . . . . . . . . . . . . . . . . . . -55oC to +125oC
Package Type E . . . . . . . . . . . . . . . . . . . . . . . . . . -40oC to +85oC
Thermal Resistance (Typical, Note 1)
θJA (oC/W) θJC (oC/W)
PDIP Package . . . . . . . . . . . . . . . . . . .
50
N/A
SBDIP Package . . . . . . . . . . . . . . . . . .
36
12
Maximum Storage Temperature Range (TSTG) . . . . -65oC to +150oC
Maximum Lead Temperature (During Soldering)
At Distance 1/16 ± 1/32 inch (1.59 ± 0.79mm)
from Case for 10s max . . . . . . . . . . . . . . . . . . . . . . . . . . . +265oC
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. θJA is measured with the component mounted on an evaluation PC board in free air.
Operating Conditions At TA = Full Package-Temperature Range. For Maximum Reliability, Operating Conditions Should be
Selected so that Operation is Always within the Following Ranges:
LIMITS
CDP1851
CDP1851C
PARAMETER
MIN
MAX
MIN
MAX
UNITS
DC Operating Voltage Range
4 10.5 4 6.5 V
Input Voltage Range
VSS
VDD
VSS
VDD
V
Functional Diagram
DATA
BUS
DATA
BUS
BUFFER
CLOCK
CS
RA0
RA1
WR/RD
RD/WR
TPB
CLEAR
ADDRESS
DECODE
AND
READ/
WRITE
LOGIC
SECTION
A
A0
A1
A2
A3
A4
A5
A6
A7
READY
STROBE
MODE
CONTROL
AND
STATUS
REGISTERS
A INT
B INT
INTERRUPT
MASKING
AND
LOGIC
SECTION
B
B0
B1
B2
B3
B4
B5
B6
B7
READY
STROBE
FIGURE 1. FUNCTIONAL DIAGRAM FOR CDP1851 AND CDP1851C
4-6


Part Number CDP1851
Description CMOS Programmable I/O Interface
Maker Intersil Corporation
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CDP1851 Datasheet PDF






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