74LVT245B 查看數據表（PDF） - Philips Electronics
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74LVT245B Datasheet PDF : 10 Pages
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Philips Semiconductors
3.3V Octal transceiver with direction pin (3-State)
Product specification
74LVT245B
FEATURES
• Octal bidirectional bus interface
• 3-State buffers
• Output capability: +64mA/-32mA
• TTL input and output switching levels
• Input and output interface capability to systems at 5V supply
• Bus-hold data inputs eliminate the need for external pull-up
resistors to hold unused inputs
• Live insertion/extraction permitted
• Power-up 3-State
• No bus current loading when output is tied to 5V bus
• Latch-up protection exceeds 500mA per JEDEC Std 17
• ESD protection exceeds 2000V per MIL STD 883 Method 3015
and 200V per Machine Model
DESCRIPTION
The LVT245B is a high-performance BiCMOS product designed for
VCC operation at 3.3V.
This device is an octal transceiver featuring non-inverting 3-State
bus compatible outputs in both send and receive directions. The
control function implementation minimizes external timing
requirements. The device features an Output Enable (OE) input for
easy cascading and a Direction (DIR) input for direction control.
QUICK REFERENCE DATA
SYMBOL
PARAMETER
tPLH
tPHL
CIN
CI/O
ICCZ
Propagation delay
An to Bn or Bn to An
Input capacitance
DIR, OE
I/O pin capacitance
Total supply current
CONDITIONS
Tamb = 25°C; GND = 0V
CL = 50pF;
VCC = 3.3V
VI = 0V or 3.0V
Outputs disabled; VI/O = 0V or 3.0V
Outputs disabled; VCC = 3.6V
TYPICAL
2.4
4
10
0.13
UNIT
ns
pF
pF
mA
ORDERING INFORMATION
PACKAGES
20-Pin Plastic SO
20-Pin Plastic SSOP
20-Pin Plastic TSSOP
TEMPERATURE RANGE
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
ORDERING INFORMATION
74LVT245B D
74LVT245B DB
74LVT245B PW
DWG NUMBER
SOT163-1
SOT339-1
SOT360-1
PIN CONFIGURATION
DIR 1
A0 2
A1 3
A2 4
A3 5
A4 6
A5 7
A6 8
A7 9
GND 10
20 VCC
19 OE
18 B0
17 B1
16 B2
15 B3
14 B4
13 B5
12 B6
11 B7
SV00014
PIN DESCRIPTION
PIN NUMBER
SYMBOL NAME AND FUNCTION
1
DIR
Direction control input
2, 3, 4, 5, 6, 7, 8, 9 A0 – A7 Data inputs/outputs (A side)
18, 17, 16, 15, 14,
13, 12, 11
B0 – B7 Data inputs/outputs (B side)
19
OE
Output enable input
(active–Low)
10
GND Ground (0V)
20
VCC
Positive supply voltage
1999 Mar 19
2
853-2143 21060
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