Philips CBT3244 Datasheet
INTEGRATED CIRCUITS
CBT3244
Octal bus switch with Quad Output
Enables
Preliminary specification
1998 Dec 08
Philips Semiconductors Preliminary specification
CBT3244Octal bus switch with Quad Output Enables
FEATURES
•Functionally equivalent to QS3244
•Standard ’244-type pinout
•5Ω 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
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
) inputs. When OE is low,
state exists between the two ports.
The CBT3244 is characterized for operation from –40°C to 85°C.
QUICK REFERENCE DATA
SYMBOL PARAMETER
t
PLH
t
PHL
C
IO(OFF)
I
CCZ
Propagation delay
An to Yn
Pin capacitance (OFF state) VO = 3V or 0V 6 pF
Total supply current Outputs disabled; VCC =5.5V µA
CL = 50pF; VCC = 5V ns
CONDITIONS
T
= 25°C; GND = 0V
amb
TYPICAL UNIT
ORDERING INFORMATION
PACKAGES TEMPERATURE RANGE OUTSIDE NORTH AMERICA NORTH AMERICA DWG NUMBER
20-Pin plastic SO –40°C to 85°C CBT3244 D CBT3244 D SOT163-1
20-Pin Plastic SSOP Type II –40°C to 85°C CBT3244 DB CBT3244 DB SOT339-1
20-Pin Plastic TSSOP Type I –40°C to 85°C CBT3244 PW CBT3244PW DH SOT360-1
PIN CONFIGURATION
1
1OE
2
1A1
3
2B4
4
1A2
5
2B3
6
1A3
7
2B2
8
1A4
9
2B1 1B4
10 11
GND
20
V
2OE
19
1B1
18
2A4
17
1B2
16
2A3
15
1B3
14
2A2
13
12
2A1
SA00501
CC
PIN DESCRIPTION
PIN NUMBER SYMBOL NAME AND FUNCTION
1, 19 1OE, 2OE Output enable
2, 4, 6, 8 1A1–1A4
11, 13, 15, 17 2A1–2A4
18, 16, 14, 12 1B1–1B4
9, 7, 5, 3 2B1–2B4
10 GND Ground (0V)
20 V
CC
Positive supply voltage
1998 Dec 08
2
Philips Semiconductors Preliminary specification
CBT3244Octal bus switch with Quad Output Enables
LOGIC SYMBOL
1A1
1A4
1OE
11
2A1
17
2A4
19
2OE
FUNCTION TABLE
INPUTS OUTPUTS
2
8
1
18
1B1
1OE 2OE 1A, 1B 2A, 2B
L L 1A = 1B 2A = 2B
12
1B4
L H 1A = 1B Z
H L Z 2A = 2B
H H Z Z
H = High voltage level
L = Low voltage level
Z = High impedance “off” state
9
2B1
3
2B4
SA00503
ABSOLUTE MAXIMUM RATINGS
SYMBOL
V
CC
I
IK
V
I
I
OK
V
OUT
I
OUT
T
stg
DC supply voltage –0.5 to +7.0 V
DC input diode current VI < 0 –18 mA
DC input voltage
DC output diode current VO < 0 –50 mA
DC output voltage
DC output current output in Low state 128 mA
Storage temperature range –65 to 150 °C
PARAMETER CONDITIONS RATING UNIT
3
3
1, 2
–1.2 to +7.0 V
output in Off or High state –0.5 to +7 V
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 ju nction
temperatures which are detrimental to reliability. The maximum junction temperature of this integrated circuit should not exceed 150°C.
3. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
1998 Dec 08
3
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