scn2681t NXP Semiconductors, scn2681t Datasheet
scn2681t
Available stocks
Related parts for scn2681t
scn2681t Summary of contents
Page 1
... SCN2681T Dual asynchronous receiver/transmitter (DUART) Product data Supersedes data of 1998 Sep 04 INTEGRATED CIRCUITS 2004 Mar 22 ...
Page 2
... MOS-LSI communications device that provides two independent full-duplex asynchronous receiver/transmitter channels in a single package. The SCN2681T features a faster bus cycle time than the standard SCN2681. The quick bus cycle eliminates or reduces the need for wait states with fast CPUs and permits high throughput in I/O intensive systems ...
Page 3
... RECEIVE HOLDING REG (3) RECEIVE SHIFT REGISTER MRA1, 2 CRA SRA CHANNEL B (AS ABOVE) INPUT PORT CHANGE OF STATE DETECTORS (4) IPCR ACR OUTPUT PORT FUNCTION SELECT LOGIC OPCR OPR Figure 1. Block Diagram 3 Product data SCN2681T TxDA RxDA TxDB RxDB 7 IP0-IP6 8 OP0-OP7 V CC GND SD00099 ...
Page 4
... OP6 8 IP0 30 OP4 9 WRN 31 OP2 10 RDN 32 OP0 11 RxDB 33 TxDA TxDB 35 RxDA 14 OP1 36 X1/CLK 15 OP3 OP5 38 RESET 17 OP7 39 CEN IP2 IP6 IP5 IP4 22 GND SD00738 Figure 2. Pin configuration NAME AND FUNCTION 4 Product data SCN2681T ...
Page 5
... Pin has an internal V supplying current Power Supply: +5V supply input. CC GND I Ground 2004 Mar 22 NAME AND FUNCTION CC 5 Product data SCN2681T CC CC pull-up device supplying pull-up CC pull-up device CC pull-up CC pull-up device CC ...
Page 6
... V, X2 floated grounded floated X1/CLK floated X1/CLK floated 0 Product data SCN2681T RATING UNIT 0 to +70 C –65 to +150 C –0.5 to +6.0 V LIMITS UNIT UNIT Min Typ Max – – 0.8 V 2.0 – – V 3.5 – – ...
Page 7
... Test conditions for interrupt outputs SYMBOL SYMBOL t Reset pulse width RES 2004 Mar RES SD00028 Figure 3. Reset Timing PARAMETER PARAMETER 7 Product data SCN2681T pF 2 LIMITS UNIT UNIT Min Max 1.0 s ...
Page 8
... Mar RLRH t RHDF t RHDI INVALID VALID t EHEL t WLWH t DVWH t WHDI VALID Figure 4. Bus Timing 1 1 PARAMETER PARAMETER Product data SCN2681T EHEL FLOAT SD00100 LIMITS UNIT UNIT Min Max 0 – ns 100 – ns 120 – ns 110 – – ns – 100 ns 10 – ...
Page 9
... Mar (a) INPUT PINS t PD OLD DATA (b) OUTPUT PINS Figure 5. Port Timing 1 1 PARAMETER PARAMETER Figure 6. Interrupt Timing PARAMETER PARAMETER 9 Product data SCN2681T NEW DATA SD00101 LIMITS UNIT UNIT Min Max 0 – – ns – 200 ns V +0. SD00102 ...
Page 10
... PARAMETER BIT TIME ( CLOCKS) t TXD t TCS Figure 8. Transmit PARAMETER PARAMETER 10 Product data SCN2681T +5V R1: 100K - 1Meg (See design note C2: 0-5pF + (STRAY < 5pF) 1K CLOCK TO OTHER CHIPS 74LS04 SCN2681 X1 TO THE REST OF THE DUART CIRCUITS R2 X2 3.6864MHz R2 = 50k to 150k ...
Page 11
... Timing shown for MR2( 2004 Mar RXS RXH Figure 9. Receive PARAMETER PARAMETER D2 D3 BREAK D3 START D4 STOP BREAK BREAK TRANSMITTED Figure 10. Transmitter Timing 11 Product data SCN2681T SD00104 LIMITS UNIT UNIT Min Max 200 – – WILL D6 NOT BE OPR( SD00094 ...
Page 12
... Figure 11. Receiver Timing BIT 9 BIT MR1( ADD#2 BIT 9 BIT STATUS DATA ADD#1 D0 Figure 12. Wake-Up Mode 12 Product data SCN2681T D6, D7, D8 WILL BE LOST RESET BY COMMAND SD00105 BIT 9 ADD#2 1 BIT 9 BIT 9 ADD ...
Page 13
... Philips Semiconductors Dual asynchronous receiver/transmitter (DUART) PLCC44: plastic leaded chip carrier; 44 leads 2004 Mar 22 13 Product data SCN2681T SOT187-2 ...
Page 14
... Date Description _3 20040322 Product data (9397 750 13055). Supersedes Product specification of 1998 Sep 04. Modifications: Remove Type number SCN2681TC1N40 (product discontinued) and references to it. _2 19980904 Product specification (9397 750 04363). ECN 853-1002 19970 of 04 September 1998. Supersedes data of 1995 May 01. _1 19950501 ...
Page 15
... Relevant changes will be communicated via a Customer Product/Process Change Notification (CPCN). Fax: + 24825 Document order number: 15 Product data SCN2681T Koninklijke Philips Electronics N.V. 2004 All rights reserved. Printed in U.S.A. Date of release: 03-04 9397 750 13055 ...