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(R)
HD-6402
Data Sheet October 31, 2005 FN2956.3
CMOS Universal Asynchronous Receiver Transmitter (UART)
The HD-6402 is a CMOS UART for interfacing computers or microprocessors to an asynchronous serial data channel. The receiver converts serial start, data, parity and stop bits. The transmitter converts parallel data into serial form and automatically adds start, parity and stop bits. The data word length can be 5, 6, 7 or 8 bits. Parity may be odd or even. Parity checking and generation can be inhibited. The stop bits may be one or two or one and one-half when transmitting 5-bit code. The HD-6402 can be used in a wide range of applications including modems, printers, peripherals and remote data acquisition systems. Utilizing the Intersil advanced scaled SAJI IV CMOS process permits operation clock frequencies up to 8.0MHz (500K Baud). Power requirements, by comparison, are reduced from 300mW to 10mW. Status logic increases flexibility and simplifies the user interface.
Features
* 8.0MHz Operating Frequency (5962-9052502) * 2.0MHz Operating Frequency (HD3-6402R) * Low Power CMOS Design * Programmable Word Length, Stop Bits and Parity * Automatic Data Formatting and Status Generation * Compatible with Industry Standard UARTs * Single +5V Power Supply * CMOS/TTL Compatible Inputs * Pb-Free Plus Anneal Available (RoHS Compliant)
Ordering Information
TEMP PACKAGE RANGE (C) PDIP PDIP* (Pb-free) CERDIP SMD# -40 to +85 -40 to +85 -55 to +125 2MHz = 125K BAUD HD3-6402R-9 HD3-6402R-9Z (Note) 59629052502MQA 8MHz = 500K BAUD PKG. DWG. # E40.6 E40.6 F40.6
Pinout
HD-6402 (PDIP, CERDIP) TOP VIEW
VCC NC GND RRD RBR8 RBR7 RBR6 RBR5 RBR4 RBR3 RBR2 RBR1 PE FE OE SFD RRC DRR DR RRI 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 40 TRC 39 EPE 38 CLS1 37 CLS2 36 SBS 35 PI 34 CRL 33 TBR8 32 TBR7 31 TBR6 30 TBR5 29 TBR4 28 TBR3 27 TBR2 26 TBR1 25 TRO 24 TRE 23 TBRL 22 TBRE 21 MR
NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. *Pb-free PDIPs can be used for through hole wave solder processing only. They are not intended for use in Reflow solder processing applications.
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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2001, 2005. All Rights Reserved All other trademarks mentioned are the property of their respective owners.
HD-6402 Functional Diagram
(32) TBR8 (33) (31) (30) (29) (28) (27) (26) TBR1
(24) TRE (22) TBRE (23) TBRL (40) TRC TRANSMITTER TIMING AND CONTROL PARITY LOGIC
TRANSMITTER BUFFER REGISTER STOP START
TRANSMITTER REGISTER MULTIPLEXER
(25) TRO (38) CLS1 (37) CLS2 (34) CRL (21) MR (36) SBS (16) SFD (39) EPE (35) PI (20) RRI (17) RRC (18) DRR (19) DR RECEIVER TIMING AND CONTROL STOP LOGIC PARITY LOGIC MULTIPLEXER RECEIVER REGISTER RECEIVER BUFFER REGISTER 3-STATE BUFFERS RBR8 OE (15) FE (14) PE (13) RBR1 (5) (6) (7) (8) (9) (10) (11) (12) (4) RRD START LOGIC
CONTROL REGISTER
(16) SFD THESE OUTPUTS ARE THREE-STATE
Control Definition
CONTROL WORD CLS 2 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 CLS 1 0 0 0 0 0 0 1 1 1 1 1 1 0 0 0 0 0 0 1 1 1 1 1 1 PI 0 0 0 0 1 1 0 0 0 0 1 1 0 0 0 0 1 1 0 0 0 0 1 1 EPE 0 0 1 1 X X 0 0 1 1 X x 0 0 1 1 X x 0 0 1 1 X x SBS 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 START BIT 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 CHARACTER FORMAT DATA BITS 5 5 5 5 5 5 6 6 6 6 6 6 7 7 7 7 7 7 8 8 8 8 8 8 PARITY BIT ODD ODD EVEN EVEN NONE NONE ODD ODD EVEN EVEN NONE NONE ODD ODD EVEN EVEN NONE NONE ODD ODD EVEN EVEN NONE NONE STOP BITS 1 1.5 1 1.5 1 1.5 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2
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HD-6402 Pin Description
PIN TYPE SYMBOL 1 2 3 4 I VCC NC GND RRD DESCRIPTION Positive Voltage Supply No Connection Ground A high level on RECEIVER REGISTER DISABLE forces the receiver holding out-puts RBR1-RBR8 to high impedance state. The contents of the RECEIVER BUFFER REGISTER appear on these three-state outputs. Word formats less than 8 characters are right justified to RBR1. See Pin 5-RBR8 See Pin 5-RBR8 See Pin 5-RBR8 See Pin 5-RBR8 See Pin 5-RBR8 See Pin 5-RBR8 See Pin 5-RBR8 A high level on PARITY ERROR indicates received parity does not match parity programmed by control bits. When parity is inhibited this output is low. A high level on FRAMING ERROR indicates the first stop bit was invalid. A high level on OVERRUN ERROR indicates the data received flag was not cleared before the last character was transferred to the receiver buffer register. A high level on STATUS FLAGS DISABLE forces the outputs PE, FE, OE, DR, TBRE to a high impedance state. The Receiver register clock is 16X the receiver data rate. A low level on DATA RECEIVED RESET clears the data received output DR to a low level. A high level on DATA RECEIVED indicates a character has been received and transferred to the receiver buffer register. Serial data on RECEIVER REGISTER INPUT is clocked into the receiver register. A high level on MASTER RESET clears PE, FE, OE and DR to a low level and sets the transmitter register empty (TRE) to a high level 18 clock cycles after MR falling edge. MR does not clear the receiver buffer register. This input must be pulsed at least once after power up. The HD-6402 must be master reset after power up. The reset pulse should meet VIH and tMR. Wait 18 clock cycles after the falling edge of MR before beginning operation. A high level on TRANSMITTER BUFFER REGISTER EMPTY indicates the transmitter buffer register has transferred its data to the transmitter register and is ready for new data. A low level on TRANSMITTER BUFFER REGISTER LOAD transfers data from inputs TBR1TBR8 into the transmitter buffer register. A low to high transition on TBRL initiates data transfer to the transmitter register. If busy, transfer is automatically delayed so that the two characters are transmitted end to end. 40 I TRC 38 39 I I CLS1 EPE 35 36 I I PI SBS 25 26 O I TRO TRB1 PIN TYPE SYMBOL 24 O TRE DESCRIPTION A high level on TRANSMITTER REGISTER EMPTY indicates completed transmission of a character including stop bits. Character data, start data and stop bits appear serially at the TRANSMITTER REGISTER OUTPUT. Character data is loaded into the TRANSMITTER BUFFER REGISTER via inputs TBR1-TBR8. For character formats less than 8 bits the TBR8, 7 and 6 inputs are ignored corresponding to their programmed word length. See Pin 26-TBR1. See Pin 26-TBR1. See Pin 26-TBR1. See Pin 26-TBR1. See Pin 26-TBR1. See Pin 26-TBR1. See Pin 26-TBR1. A high level on CONTROL REGISTER LOAD loads the control register with the control word. The control word is latched on the falling edge of CRL. CRL may be tied high. A high level on PARITY INHIBIT inhibits parity generation, parity checking and forces PE output low. A high level on STOP BIT SELECT selects 1.5 stop bits for 5 character format and 2 stop bits for other lengths. These inputs program the CHARACTER LENGTH SELECTED (CLS1 low CLS2 low 5 bits) (CLS1 high CLS2 low 6 bits) (CLS1 low CLS2 high 7 bits) (CLS1 high CLS2 high 8 bits.) See Pin 37-CLS2. When PI is low, a high level on EVEN PARITY ENABLE generates and checks even parity. A low level selects odd parity. The TRANSMITTER REGISTER CLOCK is 16X the transmit data rate.
5
O
RBR8
27 28 29 30 31 32 33 34
I I I I I I I I
TBR2 TBR3 TBR4 TBR5 TBR6 TBR7 TBR8 CRL
6 7 8 9 10 11 12 13
O O O O O O O O
RBR7 RBR6 RBR5 RBR4 RBR3 RBR2 RBR1 PE
14 15
O O
FE OE
37
I
CLS2
16
I
SFD
17 18 19
I I O
RRC DRR DR
20 21
I I
RRI MR
A 0.1F decoupling capacitor from the VCC pin to the GND is recommended.
22
O
TBRE
23
I
TBRL
3
HD-6402
20 21
19 22
18 23
17 24
16 25
15 26
14 27
13 28
12 29
HD-6402
11 30
10 31
9 32
8 33
7 34
6 35
5 36
4 37
3 38
2 39
1 40
Transmitter Operation
The transmitter section accepts parallel data, formats the data and transmits the data in serial form on the Transmitter Register Output (TRO) terminal (See serial data format). Data is loaded from the inputs TBR1-TBR8 into the Transmitter Buffer Register by applying a logic low on the Transmitter Buffer Register Load (TBRL) input (A). Valid data must be present at least tset prior to and thold following the rising edge of TBRL. If words less than 8 bits are used, only the least significant bits are transmitted. The character is right justified, so the least significant bit corresponds to TBR1 (B). The rising edge of TBRL clears Transmitter Buffer Register Empty (TBRE). 0 to 1 Clock cycles later, data is transferred to the transmitter register, the Transmitter Register Empty (TRE) pin goes to a low state, TBRE is set high and serial data information is transmitted. The output data is clocked by Transmitter Register Clock (TRC) at a clock rate 16 times the data rate. A second low level pulse on TBRL loads data into the Transmitter Buffer Register (C). Data transfer to the transmitter register is delayed until transmission of the current data is complete (D). Data is automatically transferred to the transmitter register and transmission of that character begins one clock cycle later.
1 TBRL TBRE 0 TO 1 CLOCK TRE TRO A B C DATA D END OF LAST STOP BIT 1/2 CLOCK
FIGURE 1. TRANSMITTER TIMING (NOT TO SCALE)
Receiver Operation
Data is received in serial form at the Receiver Register Input (RRI). When no data is being received, RRI must remain high. The data is clocked through the Receiver Register Clock (RRC). The clock rate is 16 times the data rate. A low level on Data Received Reset (DRR) clears the Data Receiver (DR) line (A). During the first stop bit data is transferred from the Receiver Register to the Receiver Buffer Register (RBR) (B). If the word is less than 8 bits, the unused most significant bits will be a logic low. The output character is right justified to the least significant bit RBR1. A logic high on Overrun Error (OE) indicates overruns. An overrun occurs when DR has not been cleared before the present character was transferred to the RBR. One clock cycle later DR is reset to a logic high, and Framing Error (FE) is evaluated (C). A logic high on FE indicates an invalid stop bit was received, a framing error. A logic high on Parity Error (PE) indicates a parity error.
4
HD-6402
BEGINNING OF FIRST STOP BIT RRI 7 1/2 CLOCK CYCLES RBR1-8, OE, PE DRR DR FE 1 CLOCK CYCLE A B C
FIGURE 2. RECEIVER TIMING (NOT TO SCALE)
START BIT
5-8 DATA BITS
1, 11/2 OR 2 STOP BITS
LSB
MSB
PARITY
IF ENABLED
FIGURE 3. SERIAL DATA FORMAT
Start Bit Detection
The receiver uses a 16X clock timing. The start bit could have occurred as much as one clock cycle before it was detected, as indicated by the shaded portion (A). The center of the start bit is defined as clock count 7 1/2. If the receiver clock is a symmetrical square wave, the center of the start bit will be located within 1/2 clock cycle, 1/32 bit or 3.125% giving a receiver margin of 46.875%. The receiver begins searching for the next start bit at the center of the first stop bit.
CLOCK RRI INPUT A START 71/2 CLOCK CYCLES 81/2 CLOCK CYCLES COUNT 71/2 DEFINED CENTER OF START BIT
FIGURE 4.
Interfacing with the HD-6402
TRANSMITTER TBR1 TBR8 CONTROL DIGITAL SYSTEM HD-6402 CONTROL RB1 RRI RS232 RECEIVER RS232 DRIVER TRO RS232 DRIVER RS232 RECEIVER
RECEIVER RB1 RRI RB8 CONTROL HD-6402 CONTROL TRO TBR1 DIGITAL SYSTEM
RB8 RECEIVER
TBR8 TRANSMITTER
FIGURE 5. TYPICAL SERIAL DATA LINK
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HD-6402
Absolute Maximum Ratings
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +8.0V Input, Output or I/O Voltage Applied . . . . . GND -0.5V to VCC +0.5V Storage Temperature Range . . . . . . . . . . . . . . . . . -65oC to +150oC Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+175oC Lead Temperature (Soldering 10s) . . . . . . . . . . . . . . . . . . . .+300oC ESD Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Class 1 Typical Derating Factor . . . . . . . . . . . 1mA/MHz Increase in ICCOP
Thermal Information
Thermal Resistance (Typical) JA JC CERDIP Package. . . . . . . . . . . . . . . . 50oC/W 12oC/W PDIP Package*. . . . . . . . . . . . . . . . . . 50oC/W N/A Gate Count . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1643 Gates *Pb-free PDIPs can be used for through hole wave solder processing only. They are not intended for use in Reflow solder processing applications.
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.
Operating Conditions
Operating Voltage Range. . . . . . . . . . . . . . . . . . . . . . +4.5V to +5.5V Operating Temperature Range HD3-6402R-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40oC to +85oC
DC Electrical Specifications VCC = 5.0V 10%, TA = -40oC to +85oC (HD3-6402R-9)
LIMITS SYMBOL VIH VIL II VOH VOL IO ICCSB ICCOP NOTE: PARAMETER Logical ``1'' Input Voltage Logical ``0'' Input Voltage Input Leakage Current Logical ``1'' Output Voltage Logical ``0'' Output Voltage Output Leakage Current Standby Supply Current Operating Supply Current (See Note) MIN 2.0 -1.0 3.0 VCC -0.4 -1.0 MAX 0.8 1.0 0.4 1.0 100 2.0 UNITS V V A V V A A mA VCC = 5.5V VCC = 4.5V VIN = GND or VCC, VCC = 5.5V IOH = -2.5mA, VCC = 4.5V IOH = -100A IOL = +2.5mA, VCC = 4.5V VO = GND or VCC, VCC = 5.5V VIN = GND or VCC; VCC = 5.5V, Output Open VCC = 5.5V, Clock Freq. = 2MHz, VIN = VCC or GND, Outputs Open CONDITIONS
Guaranteed, but not 100% tested
Capacitance TA = +25oC
LIMIT PARAMETER Input Capacitance Output Capacitance SYMBOL CIN COUT CONDITIONS Freq. = 1MHz, all measurements are referenced to device GND TYPICAL 25 25 UNITS pF pF
AC Electrical Specifications VCC = 5.0V 10%, TA = -40oC to +85oC (HD3-6402R-9)
LIMITS HD-6402R SYMBOL (1) fCLOCK (2) tPW (3) tMR (4) tSET (5) tHOLD (6) tEN PARAMETER Clock Frequency Pulse Widths, CRL, DRR, TBRL Pulse Width MR Input Data Setup Time Input Data Hold Time Output Enable Time MIN D.C. 150 150 50 60 MAX 2.0 160 LIMITS HD-6402B MIN D.C. 75 150 20 20 MAX 8.0 35 UNITS MHz ns ns ns ns ns CONDITIONS CL = 50pF See Switching Waveform
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HD-6402 Switching Waveforms
CLS1, CLS2, SBS, PI, EPE TBR1 - TBR8 VALID DATA VALID DATA SFD RRD
TBRL (4) tSET tPW (2) tHOLD (5)
CRL (4) tSET tPW (2) tHOLD (5)
STATUS OR RBR1 - RBR8 tEN (6)
FIGURE 6. DATA INPUT CYCLE
FIGURE 7. CONTROL REGISTER LOAD CYCLE
FIGURE 8. STATUS FLAG OUTPUT ENABLE TIME OR DATA OUTPUT ENABLE TIME
A.C. Testing Input, Output Waveform
INPUT VIH + 20% VIH 1.5V VIL - 50% VIL 1.5V VOL OUTPUT VOH
FIGURE 9. NOTE: A.C. Testing: All input signals must switch between VIL - 50% VIL and VIH + 20% VIH. Input rise and fall times are driven at 1ns/V.
Test Circuit
OUT CL (SEE NOTE)
FIGURE 10. NOTE: Includes stray and jig capacitance, CL = 50pF.
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems. Intersil Corporation's quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com 7

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