74HC7245 PDF даташит
Спецификация 74HC7245 изготовлена «Philips» и имеет функцию, называемую «Octal bus Schmitt-trigger transceiver 3-state». |
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Детали детали
Номер произв | 74HC7245 |
Описание | Octal bus Schmitt-trigger transceiver 3-state |
Производители | Philips |
логотип |
7 Pages
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INTEGRATED CIRCUITS
DATA SHEET
For a complete data sheet, please also download:
• The IC06 74HC/HCT/HCU/HCMOS Logic Family Specifications
• The IC06 74HC/HCT/HCU/HCMOS Logic Package Information
• The IC06 74HC/HCT/HCU/HCMOS Logic Package Outlines
74HC/HCT7245
Octal bus Schmitt-trigger
transceiver; 3-state
Product specification
File under Integrated Circuits, IC06
December 1990
No Preview Available ! |
Philips Semiconductors
Octal bus Schmitt-trigger transceiver;
3-state
Product specification
74HC/HCT7245
FEATURES
• Octal bidirectional bus interface
• Non-inverting 3-state outputs
• Output capability: bus driver
• ICC category: MSI
• Schmitt-trigger action on all data
inputs
GENERAL DESCRIPTION
The 74HC/HCT7245 are high-speed
Si-gate CMOS devices and are pin
compatible with low power Schottky
TTL (LSTTL). They are specified in
compliance with JEDEC standard
no. 7A.
The 74HC/HCT7245 are octal
transceivers featuring non-inverting
3-state bus compatible outputs in
both send and receive directions. The
“7245” features an output enable
(OE) input for easy cascading and a
send/receive input (DIR) for direction
control. OE controls the outputs so
that the buses are effectively isolated.
The 74HC/HCT7245 have
Schmitt-trigger inputs. These inputs
are capable of transforming slowly
changing input signals into sharply
defined jitter-free output signals.
The “7245” is identical to the “245” but
has hysteresis on the data inputs.
FUNCTION TABLE
INPUTS
OE DIR
LL
LH
HX
INPUTS/OUTPUTS
An
A=B
inputs
Z
Bn
inputs
B=A
Z
Notes
1. H = HIGH voltage level
L = LOW voltage level
X = don’t care
Z = high impedance OFF-state
QUICK REFERENCE DATA
GND = 0 V; Tamb = 25 °C; tr = tf = 6 ns
SYMBOL PARAMETER
CONDITIONS
tPHL/ tPLH
CI
CI/O
CPD
propagation delay An to Bn
input capacitance
input/output capacitance
power dissipation capacitance per transceiver
CL = 15 pF; VCC = 5 V
notes 1 and 2
Notes
1. CPD is used to determine the dynamic power dissipation (PD in µW):
PD = CPD × VCC2 × fi + ∑ (CL × VCC2 × fo) where:
fi = input frequency in MHz
fo = output frequency in MHz
∑ (CL × VCC2 × fo) = sum of outputs
CL = output load capacitance in pF
VCC = supply voltage in V
2. For HC the condition is VI = GND to VCC
For HCT the condition is VI = GND to VCC − 1.5 V
TYPICAL
HC HCT
8 12
3.5 3.5
10 10
40 40
UNIT
ns
pF
pF
pF
ORDERING INFORMATION
See “74HC/HCT/HCU/HCMOS Logic Package Information”.
December 1990
2
No Preview Available ! |
Philips Semiconductors
Octal bus Schmitt-trigger transceiver;
3-state
PIN DESCRIPTION
PIN NO.
1
2, 3, 4, 5, 6, 7, 8, 9
10
18, 17, 16, 15, 14, 13, 12, 11
19
20
SYMBOL
DIR
A0 to A7
GND
B0 to B7
OE
VCC
Product specification
74HC/HCT7245
NAME AND FUNCTION
direction control
data inputs/outputs
ground (0 V)
data inputs/outputs
output enable input (active LOW)
positive supply voltage
alfpage
DIR 1
A0 2
A1 3
A2 4
A3 5
A4 6
A5 7
A6 8
A7 9
GND 10
20 VCC
19 OE
7245
18 B0
17 B1
16 B2
15 B3
14 B4
13 B5
12 B6
11 B7
MBA327
ge
19
OE
1 DIR
2 A0
9 A7
age
B0 18
B7 11
MBA330
19 G3
3EN1
1
3EN2
1
2 2 18
3 17
4 16
5 15
6 14
7 13
8 12
9 11
MBA404
Fig.1 Pin configuration.
Fig.2 Functional diagram.
Fig.3 IEC logic symbol.
December 1990
3
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