74LVCH245A PDF даташит
Спецификация 74LVCH245A изготовлена «Philips» и имеет функцию, называемую «Octal bus transceiver». |
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Детали детали
Номер произв | 74LVCH245A |
Описание | Octal bus transceiver |
Производители | Philips |
логотип |
10 Pages
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INTEGRATED CIRCUITS
74LVC245A/74LVCH245A
Octal bus transceiver with direction pin
with 5-volt tolerant inputs/outputs
(3-State)
Product specification
Supersedes data of 1997 Dec 19
IC24 Data Handbook
1998 May 20
Philips
Semiconductors
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Philips Semiconductors
Octal bus transceiver with direction pin with
5-volt tolerant inputs/outputs (3-State)
Product specification
74LVC245A
74LVCH245A
FEATURES
• 5-volt tolerant inputs/outputs, for interfacing with 5-volt logic
• Supply voltage range of 2.7V to 3.6V
• Complies with JEDEC standard no. 8-1A
• CMOS low power consumption
• Direct interface with TTL levels
• High impedance when VCC = 0V
• Bushold on all data inputs (74LVCH245A only)
DESCRIPTION
The 74LVC245A/74LVCH245A is a high-performance, low-power,
low-voltage, Si-gate CMOS device, superior to most advanced
CMOS compatible TTL families.
Inputs can be driven from either 3.3V or 5V devices. In 3-State
operation, outputs can handle 5V. These features allow the use of
these devices as translators in a mixed 3.3V/5V environment.
The 74LVC245A/74LVCH245A is an octal transceiver featuring
non-inverting 3-State bus compatible outputs in both send and
receive directions. The ’245’ features an output enable (OE) input for
easy cascading and a send/receive (DIR) input for direction control.
OE controls the outputs so that the buses are effectively isolated.
The ’245’ is functionally identical to the ’640’, but the ’640’ has true
(non-inverting) outputs.
QUICK REFERENCE DATA
SYMBOL
PARAMETER
CONDITIONS
tPHL/tPLH
Propagation delay
An to Bn;
Bn to An
CL = 50pF
VCC = 3.3V
CI Input capacitance
CI/O Input/output capacitance
CPD
Power dissipation capacitance per
buffer
Notes 1 and 2
NOTE:
1. CPD is used to determine the dynamic power dissipation (PD in mW):
PD = CPD x VCC2 x fi + S (CL x VCC2 x fo) where:
fi = input frequency in MHz; CL = output load capacity in pF;
fo = output frequency in MHz; VCC = supply voltage in V;
S (CL x VCC2 x fo) = sum of outputs.
2. The condition is VI = GND to VCC
ORDERING INFORMATION
PACKAGES
20-Pin Plastic Shrink Small Outline (SO)
20-Pin Plastic Shrink Small Outline (SSOP) Type II
20-Pin Plastic Thin Shrink Small Outline (TSSOP) Type I
20-Pin Plastic Shrink Small Outline (SO)
20-Pin Plastic Shrink Small Outline (SSOP) Type II
20-Pin Plastic Thin Shrink Small Outline (TSSOP) Type I
TEMPERATURE
OUTSIDE
RANGE
NORTH AMERICA
–40°C to +85°C 74LVC245A D
–40°C to +85°C 74LVC245A DB
–40°C to +85°C 74LVC245A PW
–40°C to +85°C 74LVCH245A D
–40°C to +85°C 74LVCH245A DB
–40°C to +85°C 74LVCH245A PW
TYPICAL
3.6
5.0
10.0
33
NORTH AMERICA
74LVC245A D
74LVC245A DB
7LVC245APW DH
74LVCH245A D
74LVCH245A DB
LVCH245APW DH
UNIT
ns
pF
pF
pF
PKG. DWG. #
SOT163-1
SOT339-1
SOT360-1
SOT163-1
SOT339-1
SOT360-1
1998 May 20
2 853-2044 19419
No Preview Available ! |
Philips Semiconductors
Octal bus transceiver with direction pin with
5-volt tolerant inputs/outputs (3-State)
Product specification
74LVC245A
74LVCH245A
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
FUNCTION
1
2, 3, 4, 5, 6,
7, 8, 9
DIR Direction control
A0 to A7 Data inputs/outputs
10 GND Ground (0V)
18, 17, 16, 15,
14, 13, 12, 11
19
B0 to B7 Data inputs/outputs
OE Output enable input (active-Low)
20 VCC Positive supply voltage
FUNCTION TABLE
INPUTS
INPUTS/OUTPUTS
OE DIR An
L L A=B
B0
Inputs
L H lnputs
B=A
HXZ
Z
H = HIGH voltage level
L = LOW voltage level
X = Don’t care
Z = High impedance OFF-state
LOGIC SYMBOL
1
DIR
2
A0
3
A1
4
A2
5
A3
6
A4
7
A5
8
A6
9
A7
LOGIC SYMBOL (IEEE/IEC)
19
OE
18 B0
17 B1
16 B2
15 B3
14 B4
13 B5
12 B6
11 B7
SV00016
19 G3
3EN1 (BA)
1 3EN2 (AB)
∇1
2 2 ∇ 18
3 17
4 16
5 15
6 14
7 13
8 12
9 11
SV00208
1998 May 20
3
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