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INTEGRATED CIRCUITS
CBT3244 Octal bus switch with Quad Output Enables
Preliminary specification 1998 Dec 08
Philips Semiconductors
Philips Semiconductors
Preliminary specification
Octal bus switch with Quad Output Enables
CBT3244
FEATURES
* Functionally equivalent to QS3244 * Standard '244-type pinout * 5 switch connection between two ports * TTL compatible control input levels * Package options include plastic small outline (D), shrink small
outline (DB), thin shrink small outline (TSSOP)
DESCRIPTION
The CBT3244 provides eight bits of high-speed TTL-compatible bus switching in a standard '244 device pinout. The low on-state resistance of the switch allows connections to be made with minimal propagation delay. The CBT3244 device is organized as two 4-bit low-impedance switches with separate output-enable (OE) inputs. When OE is low, the switch is on and data can flow from port A to port B, or vice versa. When OE is high, the switch is open and high-impedance state exists between the two ports. The CBT3244 is characterized for operation from -40C to 85C.
QUICK REFERENCE DATA
SYMBOL tPLH tPHL CIO(OFF) ICCZ PARAMETER Propagation delay An to Yn Pin capacitance (OFF state) Total supply current CONDITIONS Tamb = 25C; GND = 0V CL = 50pF; VCC = 5V VO = 3V or 0V Outputs disabled; VCC =5.5V 6 TYPICAL UNIT ns pF A
ORDERING INFORMATION
PACKAGES 20-Pin plastic SO 20-Pin Plastic SSOP Type II 20-Pin Plastic TSSOP Type I TEMPERATURE RANGE -40C to 85C -40C to 85C -40C to 85C OUTSIDE NORTH AMERICA CBT3244 D CBT3244 DB CBT3244 PW NORTH AMERICA CBT3244 D CBT3244 DB CBT3244PW DH DWG NUMBER SOT163-1 SOT339-1 SOT360-1
PIN CONFIGURATION
PIN DESCRIPTION
PIN NUMBER 1, 19 SYMBOL 1OE, 2OE 1A1-1A4 2A1-2A4 1B1-1B4 2B1-2B4 GND VCC Ground (0V) Positive supply voltage NAME AND FUNCTION Output enable
1OE 1A1 2B4 1A2 2B3 1A3 2B2 1A4 2B1
1 2 3 4 5 6 7 8 9
20 19 18 17 16 15 14 13 12 11
VCC 2OE 1B1 2A4 1B2 2A3 1B3 2A2 1B4 2A1
2, 4, 6, 8 11, 13, 15, 17 18, 16, 14, 12 9, 7, 5, 3 10 20
GND 10
SA00501
1998 Dec 08
2
Philips Semiconductors
Preliminary specification
Octal bus switch with Quad Output Enables
CBT3244
LOGIC SYMBOL
2 1A1 18 1B1
FUNCTION TABLE
INPUTS 1OE L 2OE L H L H OUTPUTS 1A, 1B 1A = 1B 1A = 1B Z Z 2A, 2B 2A = 2B Z 2A = 2B Z
8 1A4
12 1B4
L H H
1 1OE 11 2A1 9 2B1
H = High voltage level L = Low voltage level Z = High impedance "off " state
17 2A4
3 2B4
19 2OE
SA00503
ABSOLUTE MAXIMUM RATINGS1, 2
SYMBOL VCC IIK VI IOK VOUT IOUT Tstg PARAMETER DC supply voltage DC input diode current DC input voltage3 VO < 0 output in Off or High state output in Low state VI < 0 CONDITIONS RATING -0.5 to +7.0 -18 -1.2 to +7.0 -50 -0.5 to +7 128 -65 to 150 UNIT V mA V mA V mA C
DC output diode current DC output voltage3
DC output current Storage temperature range
NOTES: 1. Stresses beyond those listed may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. 2. The performance capability of a high-performance integrated circuit in conjunction with its thermal environment can create junction temperatures which are detrimental to reliability. The maximum junction temperature of this integrated circuit should not exceed 150C. 3. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
1998 Dec 08
3
Philips Semiconductors
Preliminary specification
Octal bus switch with Quad Output Enables
CBT3244
RECOMMENDED OPERATING CONDITIONS
LIMITS SYMBOL VCC VIH VIL Tamb DC supply voltage High-level input voltage Low-level Input voltage Operating free-air temperature range -40 PARAMETER Min 4.5 2.0 0.8 +85 Max 5.5 V V V C UNIT
DC ELECTRICAL CHARACTERISTICS
LIMITS SYMBOL PARAMETER TEST CONDITIONS Tamb = -40C to +85C Min VIK II ICC ICC CI CIO(OFF) ron3 Input clamp voltage Input leakage current Quiescent supply current2 Additional supply current per input pin2 Control pins Power-off leakage current VCC = 4.5V; II = -18mA VCC = 5.5V; VI = GND or 5.5V VCC = 5.5V; IO = 0, VI = VCC or GND VCC = 5.5V, one input at 3.4V, other inputs at VCC or GND VI= 3V or 0, OE = VCC VO = 3V or 0 VCC = 4.5V; V1 = 0V; II = 64mA On-resistance VCC = 4.5V; V1 = 0V; II = 30mA VCC = 4.5V; V1 = 0V; II = 15mA 3 6 5 5 10 7 7 15 Typ1 Max -1.2 5 50 3.5 V A A mA pF pF UNIT
NOTES: 1. All typical values are at VCC = 5V, TA = 25 C 2. This is the increase in supply current for each input that is at the specified TTL voltage level rather than VCC or GND 3. Measured by the voltage drop between the A and the B terminals at the indicated current through the switch. On-state resistance is determined by the lowest voltage of the two (A or B) terminals.
AC CHARACTERISTICS
GND = 0V; tR; CL = 50pF 74CBT3244 SYMBOL PARAMETER FROM (INPUT) TO (OUTPUT) Tamb = -40C to +85 VCC = +5.0V 0.5V Min tpd ten tdis Propagation delay1 Output enable time to High and Low level Output disable time from High and Low level A or B OE OE B or A A or B A or B 1.0 1.0 Max .25 8.9 7.4 ns ns ns UNIT
NOTES: 1. This parameter is warranted but not production tested. The propagation delay is based on the RC time constant of the typical on-state resistance of the switch and a load capacitance of 50 pF, when driven by an ideal voltage source (zero output impedance).
1998 Dec 08
4
Philips Semiconductors
Preliminary specification
Octal bus switch with Quad Output Enables
CBT3244
AC WAVEFORMS
VM = 1.5V, VIN = GND to 3.0V
3V 3V 1.5V INPUT 0V tPLH tPHL VOH 1.5V OUTPUT VOL Output Waveform 2 S1 at Open (see Note) 1.5V Output Waveform 1 S1 at 7 V (see Note) tPZH tPZL tPLZ 1.5V Output Control (Low-level enabling 1.5 V 1.5 V 0V 3.5V 1.5 V tPHZ VOH - 0.3V 1.5 V 0V Note: Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control. Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
VOL + 0.3V VOL VOH
SA00028
Waveform 1. Input to Output Propagation Delays
SA00029
Waveform 2. 3-State Output Enable and Disable Times
TEST CIRCUIT AND WAVEFORMS
7V From Output Under Test CL = 50 pF 500 S1 Open GND 500
Load Circuit
TEST tpd tPLZ/tPZL tPHZ/tPZH
S1 open 7V open
DEFINITIONS Load capacitance includes jig and probe capacitance; CL = see AC CHARACTERISTICS for value.
SA00012
NOTES: 1. All input pulses are supplied by generators having the following characteristics: PRR 10MHz, ZO = 50 , tr 2.5 ns, tf 2.5 ns. 2. The outputs are measured one at a time with one transition per measurement.
1998 Dec 08
5
Philips Semiconductors
Preliminary specification
Octal bus switch with Quad Output Enables
CBT3244
SO20: plastic small outline package; 20 leads; body width 7.5 mm
SOT163-1
1998 Dec 08
6
Philips Semiconductors
Preliminary specification
Octal bus switch with Quad Output Enables
CBT3244
SSOP20: plastic shrink small outline package; 20 leads; body width 5.3 mm
SOT339-1
1998 Dec 08
7
Philips Semiconductors
Preliminary specification
Octal bus switch with Quad Output Enables
CBT3244
TSSOP20: plastic thin shrink small outline package; 20 leads; body width 4.4 mm
SOT360-1
1998 Dec 08
8
Philips Semiconductors
Preliminary specification
Octal bus switch with Quad Output Enables
CBT3244
NOTES
1998 Dec 08
9
Philips Semiconductors
Preliminary specification
Octal bus switch with Quad Output Enables
CBT3244
Data sheet status
Data sheet status Objective specification Preliminary specification Product specification Product status Development Qualification Definition [1] This data sheet contains the design target or goal specifications for product development. Specification may change in any manner without notice. This data sheet contains preliminary data, and supplementary data will be published at a later date. Philips Semiconductors reserves the right to make chages at any time without notice in order to improve design and supply the best possible product. This data sheet contains final specifications. Philips Semiconductors reserves the right to make changes at any time without notice in order to improve design and supply the best possible product.
Production
[1] Please consult the most recently issued datasheet before initiating or completing a design.
Definitions
Short-form specification -- The data in a short-form specification is extracted from a full data sheet with the same type number and title. For detailed information see the relevant data sheet or data handbook. Limiting values definition -- Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information -- Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or modification.
Disclaimers
Life support -- These products are not designed for use in life support appliances, devices or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips Semiconductors customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application. Right to make changes -- Philips Semiconductors reserves the right to make changes, without notice, in the products, including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. Philips Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless otherwise specified. Philips Semiconductors 811 East Arques Avenue P.O. Box 3409 Sunnyvale, California 94088-3409 Telephone 800-234-7381 (c) Copyright Philips Electronics North America Corporation 1998 All rights reserved. Printed in U.S.A. print code Document order number: Date of release: 05-96
Philips Semiconductors
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