CDP1854 Datasheet, PDF (1/12 Pages) Intersil Corporation – High Reliability CMOS Programmable Universal Asynchronous Receiver/Transmitter (UART)

March 1997
CDP1854A/3,
CDP1854AC/3
High Reliability CMOS Programmable Universal
Asynchronous Receiver/Transmitter (UART)
Features
• Two Operating Modes
- Mode 0 - Functionally Compatible with Industry
Types Such as the TR1602A and CDP6402
- Mode 1 - Interfaces Directly with CDP1800 Series
Microprocessors without Additional Components
• Full or Half-Duplex Operation
• Parity, Framing, and Overrun Error Detection
• Fully Programmable with Externally Selectable Word
Length (5-8 Bits), Parity Inhibit, Even/Odd Parity, and
1, 1-1/2, or 2 Stop Bits
Ordering Information
PACK-
AGE
SBDIP
TEMP.
5V/200K
10V/400K PKG.
RANGE
BAUD
BAUD
NO.
-55^oC to +125^oC CDP1854ACD3 CDP1854ACD3 D40.6
Description
The CDP1854A/3 and CDP1854AC/3 are high reliability
silicon gate CMOS Universal Asynchronous Receiver/Trans-
mitter (UART) circuits. They are designed to provide the
necessary formatting and control for interfacing between
serial and parallel data. For example, these UARTs can be
used to interface between a peripheral or terminal with serial
I/O ports and the 8-bit CDP1800-series microprocessor
parallel data bus system. The CDP1854A/3 is capable of full
duplex operation, i.e., simultaneous conversion of serial
input data to parallel output data and parallel input data to
serial output data.
The CDP1854A/3 UART can be programmed to operate in
one of two modes by using the mode control input. When the
mode input is high (MODE = 1), the CDP1854A/3 is directly
compatible with the CDP1800 series microprocessor system
without additional interface circuitry. When the mode input is
low (MODE = 0), the device is functionally compatible with
industry standard UARTs such as the TR1602A and
CDP6402. It is also pin compatible with these types, except
that pin 2 is used for the mode control input.
The CDP1854A/3 and the CDP1854AC/3 are functionally
identical. The CDP1854A/3 has a recommended operating
voltage range of 4V to 10.5V, and the CDP1854AC/3 has a
recommended operating voltage range of 4V to 6.5V.
Pinouts
CDP1854A/3, CDP1854AC/3 (SBDIP) (MODE 0)
TOP VIEW
VDD 1
MODE (V_SS) 2
V_SS 3
RRD 4
R BUS 7 5
R BUS 6 6
R BUS 5 7
R BUS 4 8
R BUS 3 9
R BUS 2 10
R BUS 1 11
R BUS 0 12
PE 13
FE 14
OE 15
SFD 16
R CLOCK 17
DAR 18
DA 19
SDI 20
40 T CLOCK
39 EPE
38 WLS 1
37 WLS 2
36 SBS
35 PI
34 CRL
33 T BUS 7
32 T BUS 6
31 T BUS 5
30 T BUS 4
29 T BUS 3
28 T BUS 2
27 T BUS 1
26 T BUS 0
25 SD0
24 TSRE
23 THRL
22 THRE
21 MR
CDP1854A/3, CDP1854AC/3 (SBDIP) (MODE 1)
TOP VIEW
V_DD 1
MODE (V_DD) 2
V_SS 3
CS2 4
R BUS 7 5
R BUS 6 6
R BUS 5 7
R BUS 4 8
R BUS 3 9
R BUS 2 10
R BUS 1 11
R BUS 0 12
INT 13
FE 14
PE/OE 15
RSEL 16
R CLOCK 17
TPB 18
DA 19
SDI 20
40 T CLOCK
39 CTS
38 ES
37 PS1
36 NC
35 CS3
34 RD/WR
33 T BUS 7
32 T BUS 6
31 T BUS 5
30 T BUS 4
29 T BUS 3
28 T BUS 2
27 T BUS 1
26 T BUS 0
25 SD0
24 RTS
23 CS1
22 THRE
21 CLEAR
NC = NO CONNECT
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
5-62
File Number 1715.2