8251A USART Datasheet

Buy 8251A

Photograph

Features

Pin Layout

Pin Description

Pin Number	Description
1	D2 - Data Bit 2
2	D3 - Data Bit 3
3	RX - Receive
4	GND - Ground
5	D4 - Data Bit 4
6	D5 - Data Bit 5
7	D6 - Data Bit 6
8	D7 - Data Bit 7
9	TXC - Transmit Clock Input (Active Low)
10	WR - Write (Active Low)
11	CS - Chip Select (Active Low)
12	C/D - Command/Data Select
13	RD - Read (Active Low)
14	RXRDY - Read Register Ready
15	TXRDY - Transmitter Register Ready
16	SYNDET/BD - See Datasheet
17	CTS - Clear To Send (Active Low)
18	TXEMPTY - Transmitter Register Empty
19	TXD - Transmit Output
20	CLK - Clock
21	RESET - Reset
22	DSR - Data Set Ready (Active Low)
23	RTS - Request to Send (Active Low)
24	DTR - Data Terminal Ready (Active Low)
25	RXC - Receive Clock (Active Low)
26	Vcc - Positive Supply
27	D0 - Data Bit 0
28	D1 - Data Bit 1

Dimensional Drawing

Technical Data

Datasheet

Application Notes