XR88C681CP/40 Exar Corporation, XR88C681CP/40 Datasheet - Page 2

• Manufacturer Part Number: XR88C681CP/40
• Description: Dual Channel UART
• Manufacturer: Exar Corporation

Specifications of XR88C681CP/40

• Features: *
• Number Of Channels: 2, DUART
• Fifo's: 1 Byte, 3 Byte
• Voltage - Supply: 5V
• With Parallel Port: Yes
• With Cmos: Yes
• Mounting Type: Through Hole
• Package / Case: 40-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Rev. 2.11
D0 - D7
Buffer
Data
Bus
TXDA
Status Register
TSR
THR
Mode Registers
Channel A
A0 - A3
RXDA
RSR
RHR
Command Decoder
Operation Control
Address Decoder
-RD -WR -CS RESET
CRA
Figure 1. Block Diagram of the XR88C681
CRB
TSR
TXDB
THR
Mode Registers
Status Register
Channel B
RXDB
RHR
RSR
Internal Data Bus
IEI IEO -IACK -INTR
Interrupt Control
MISR
IMR
2
IVR
ISR
State Detectors
Change of
Input Port
IP0 - IP6
IPR
IPCR
ACR
CSRA
Counter/Timer
X1/CLK
Generator
Oscillator
Bit Rate
Timing
Function Select
Output Port
X2
Output Port
OP0 - OP7
CSRB
OPCR
OPR
Logic