74HC243
Quad bus transceiver; 3-state
Rev. 03 — 12 November 2004
Product data sheet
1. General description
The 74HC243 is a high-speed Si-gate CMOS device and is pin compatible with low power
Schottky TTL (LSTTL). The 74HC243 is specified in compliance with JEDEC
standard no. 7A.
The 74HC243 is a quad bus transceiver featuring non-inverting 3-state bus compatible
outputs in both send and receive directions. The 74HC243 is designed for 4-line
asynchronous 2-way data communications between data buses.
The output enable inputs (OEA and OEB) can be used to isolate the buses.
The 74HC243 is similar to the 74HC242 but has non-inverting (true) outputs.
2. Features
s
s
s
s
s
Non-inverting 3-state outputs
2-way asynchronous data bus communication
Low-power dissipation
Complies with JEDEC standard no. 7A
ESD protection:
x
HBM EIA/JESD22-A114-B exceeds 2000 V
x
MM EIA/JESD22-A115-A exceeds 200 V.
s
Multiple package options
s
Specified from
−40 °C
to +80
°C
and from
−40 °C
to +125
°C.
Philips Semiconductors
74HC243
Quad bus transceiver; 3-state
3. Quick reference data
Table 1:
Quick reference data
GND = 0 V; T
amb
= 25
°
C; t
r
= t
f
= 6 ns.
Symbol
t
PHL
, t
PLH
C
I
C
I/O
C
PD
[1]
Parameter
propagation delay An to Bn;
Bn to An
input capacitance
input/output capacitance
power dissipation
capacitance per transceiver
Conditions
C
L
= 15 pF; V
CC
= 5 V
Min
-
-
-
Typ
6
3.5
10
26
Max
-
-
-
-
Unit
ns
pF
pF
pF
V
I
= GND to V
CC
[1]
-
C
PD
is used to determine the dynamic power dissipation (P
D
in
µW).
P
D
= C
PD
×
V
CC2
×
f
i
×
N +
∑(C
L
×
V
CC2
×
f
o
) where:
f
i
= input frequency in MHz;
f
o
= output frequency in MHz;
C
L
= output load capacitance in pF;
V
CC
= supply voltage in V;
N = number of inputs switching;
∑(C
L
×
V
CC2
×
f
o
) = sum of outputs.
4. Ordering information
Table 2:
Ordering information
Package
Temperature range
74HC243N
74HC243D
74HC243DB
−40 °C
to +125
°C
−40 °C
to +125
°C
−40 °C
to +125
°C
Name
DIP14
SO14
SSOP14
Description
plastic dual in-line package; 14 leads (300 mil)
plastic small outline package; 14 leads;
body width 3.9 mm
plastic shrink small outline package; 14 leads;
body width 5.3 mm
Version
SOT27-1
SOT108-1
SOT337-1
Type number
9397 750 13808
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Product data sheet
Rev. 03 — 12 November 2004
2 of 17
Philips Semiconductors
74HC243
Quad bus transceiver; 3-state
5. Functional diagram
13
OEB
ENABLE
EXITING
1
OEA
3
A0
B0
11
4
A1
B1
10
5
A2
B2
9
6
A3
B3
8
001aab953
Fig 1. Functional diagram
13
OEB
ENABLE
EXITING
13
1
EN1
EN2
1
OEA
3
A0
B0
11
3
4
1
2
11
10
9
8
001aab951
6
A3
B3
5
8
6
001aab950
Fig 2. Logic symbol
Fig 3. IEC logic symbol
9397 750 13808
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Product data sheet
Rev. 03 — 12 November 2004
3 of 17
Philips Semiconductors
74HC243
Quad bus transceiver; 3-state
6. Pinning information
6.1 Pinning
OEA
n.c.
A0
A1
A2
A3
GND
1
2
3
4
5
6
7
001aab948
14 V
CC
13 OEB
12 n.c.
243
11 B0
10 B1
9
8
B2
B3
Fig 4. Pin configuration
6.2 Pin description
Table 3:
Symbol
OEA
n.c.
A0
A1
A2
A3
GND
B3
B2
B1
B0
n.c.
OEB
V
CC
Pin description
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Description
output enable input (active LOW)
not connected
data input or output
data input or output
data input or output
data input or output
ground (0 V)
data output or input
data output or input
data output or input
data output or input
not connected
output enable input
positive supply voltage
9397 750 13808
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Product data sheet
Rev. 03 — 12 November 2004
4 of 17
Philips Semiconductors
74HC243
Quad bus transceiver; 3-state
7. Functional description
7.1 Function table
Table 4:
Control
OEA
L
H
L
H
[1]
Function table
[1]
Input or output
OEB
L
L
H
H
An
input
Z
Z
A=B
Bn
B=A
Z
Z
input
H = HIGH voltage level;
L = LOW voltage level;
Z = high-impedance OFF-state.
8. Limiting values
Table 5:
Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to
GND (ground = 0 V).
Symbol
V
CC
I
IK
I
OK
I
O
I
CC
, I
GND
T
stg
P
tot
Parameter
supply voltage
input diode current
output diode current
output source or sink
current
V
CC
or GND current
storage temperature
power dissipation
DIP14 package
SO14 and SSOP16
packages
[1]
[2]
[1]
[2]
Conditions
V
I
<
−0.5
V or V
I
> V
CC
+ 0.5 V
V
O
<
−0.5
V or
V
O
> V
CC
+ 0.5 V
V
O
=
−0.5
V to V
CC
+ 0.5 V
Min
−0.5
-
-
-
-
−65
-
-
Max
+7
±20
±20
±35
±70
+150
750
500
Unit
V
mA
mA
mA
mA
°C
mW
mW
Above 70
°
C: P
tot
derates linearly with 12 mW/K.
Above 70
°
C: P
tot
derates linearly with 8 mW/K.
9397 750 13808
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Product data sheet
Rev. 03 — 12 November 2004
5 of 17
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