CBT3244 Просмотр технического описания (PDF) - Philips Electronics
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CBT3244 Datasheet PDF : 10 Pages
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Philips Semiconductors
Octal bus switch with Quad Output Enables
Preliminary specification
CBT3244
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) 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 –40°C to 85°C.
QUICK REFERENCE DATA
SYMBOL
PARAMETER
tPLH
tPHL
CIO(OFF)
ICCZ
Propagation delay
An to Yn
Pin capacitance (OFF state)
Total supply current
CONDITIONS
Tamb = 25°C; GND = 0V
CL = 50pF; VCC = 5V
VO = 3V or 0V
Outputs disabled; VCC =5.5V
TYPICAL
6
UNIT
ns
pF
µA
ORDERING INFORMATION
PACKAGES
20-Pin plastic SO
20-Pin Plastic SSOP Type II
20-Pin Plastic TSSOP Type I
TEMPERATURE RANGE OUTSIDE NORTH AMERICA
–40°C to 85°C
CBT3244 D
–40°C to 85°C
CBT3244 DB
–40°C to 85°C
CBT3244 PW
NORTH AMERICA
CBT3244 D
CBT3244 DB
CBT3244PW DH
DWG NUMBER
SOT163-1
SOT339-1
SOT360-1
PIN CONFIGURATION
1OE 1
1A1 2
2B4 3
1A2 4
2B3 5
1A3 6
2B2 7
1A4 8
2B1 9
GND 10
20 VCC
19 2OE
18 1B1
17 2A4
16 1B2
15 2A3
14 1B3
13 2A2
12 1B4
11 2A1
PIN DESCRIPTION
PIN NUMBER
SYMBOL
1, 19
1OE, 2OE
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
20
VCC
NAME AND FUNCTION
Output enable
Ground (0V)
Positive supply voltage
SA00501
1998 Dec 08
2
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