TC74ACT240,244P/F/FW/FT
2006-02-01
1
TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic
TC74ACT240P,TC74ACT240F,TC74ACT240FW,TC74ACT240FT
TC74ACT244P,TC74ACT244F,TC74ACT244FW,TC74ACT244FT
Octal Bus Buffer
TC74ACT240P/F/FW/FT Inverted, 3-State
Outputs
TC74ACT244P/F/FW/FT Non-Inverted, 3-State
Outputs
The TC74ACT240 and 244 are advanced high speed CMOS
OCTAL BUS BUFFERs fabricated with silicon gate and
double-layer metal wiring C2MOS technology.
They achieve the high speed operation similar to equivalent
Bipolar Schottky TTL while maintaining the CMOS low power
dissipation.
The 74ACT240 is an inverting 3-state buffer while the
74ACT244 is non-inverting. Both devices have two active-low
output enables.
These devices are designed to be used in such applications as
3-state memory address drivers.
All inputs are equipped with protection circuits against static
discharge or transient excess voltage.
Features
• High speed: tpd = 5.0 ns (typ.) at VCC = 5 V
• Low power dissipation: ICC = 8 µA (max) at Ta = 25°C
• Compatible with TTL outputs: VIL = 0.8 V (max)
V
IH = 2.0 V (min)
• Symmetrical output impedance: |IOH| = IOL = 24 mA (min)
Capability of driving 50 Ω
transmission lines.
• Balanced propagation delays: tpLH ∼
−tpHL
• Pin and function compatible with 74F240/244
Weight
DIP20-P-300-2.54A : 1.30 g (typ.)
SOP20-P-300-1.27A : 0.22 g (typ.)
SOP20-P-300-1.27 : 0.22 g (typ.)
SOL20-P-300-1.27 : 0.46 g (typ.)
TSSOP20-P-0044-0.65A : 0.08 g (typ.)
Note: xxxFW (JEDEC SOP) is not available in
Japan.
TC74ACT240P, TC74ACT244P
TC74ACT240F, TC74ACT244F
TC74ACT240FW, TC74ACT244FW
TC74ACT240FT, TC74ACT244FT
TC74ACT240,244P/F/FW/FT
2006-02-01
2
Pin Assignment
IEC Logic Symbol
Truth Table
Inputs Outputs
G A
n Y
n (244) n
Y (240)
L L L H
L H H L
H X Z Z
X: Don’t care
Z: High impedance
VCC
16
2A4
2Y1
2A315
14
13
12
11
20 1
2
3
4
5
6
7
1A3
2Y2
1A4
1Y2
1A1
3Y1
8
1Y1
19
2A2
G2
1A2
3Y2
18
9
4Y2
GND 10 2A1
17
4Y1
(top view)
TC74ACT240
G1 VCC
16
2A4
15
14
13
12
11
20 1
2
3
4
5
6
72Y2
1A4
1Y3
8
1Y1
19
2A2
G2
1A2
18
9
2Y4
GND 10 2A1
17
1Y4
(top view)
TC74ACT244
1Y2
2A3
2Y1
1A3
2Y3
1A1
G1
(1)
(2)
(6)
(4)
1A2
1A4
1A3
(8)
(18)
(14)
2Y1
4Y1
(16)
(12)
3Y1
EN
G1
1Y1
1A1
TC74ACT240
(19)
(11)
(15)
(13)
2A2
2A4
2A3
(17)
(9)
(5)
2Y2
4Y2
(7)
(3)
3Y2
EN
G2
1Y2
2A1
(1)
(2)
(6)
(4)
1A2
1A4
1A3
(8)
(18)
(14)
1Y2
1Y4
(16)
(12)
1Y3
EN
G1
1Y1
1A1
TC74ACT244
(19)
(11)
(15)
(13)
2A2
2A4
2A3
(17)
(9)
(5)
2Y2
2Y4
(7)
(3)
2Y3
EN
G2
2Y1
2A1
TC74ACT240,244P/F/FW/FT
2006-02-01
3
Absolute Maximum Ratings (Note 1)
Characteristics Symbol Rating Unit
Supply voltage range VCC −0.5 to 7.0 V
DC input voltage VIN −0.5 to VCC + 0.5 V
DC output voltage VOUT −0.5 to VCC + 0.5 V
Input diode current IIK ±20 mA
Output diode current IOK ±50 mA
DC output current IOUT ±50 mA
DC VCC/ground current ICC ±200 mA
Power dissipation PD 500 (DIP) (Note 2)/180 (SOP/TSSOP) mW
Storage temperature Tstg −65 to 150 °C
Note 1: Exceeding any of the absolute maximum ratings, even briefly, lead to deterioration in IC performance or
even destruction.
Note 2: 500 mW in the range of Ta = −40 to 65°C. From Ta = 65 to 85°C a derating factor of −10 mW/°C should be
applied up to 300 mW.
Recommended Operating Conditions (Note)
Characteristics Symbol Rating Unit
Supply voltage VCC 4.5 to 5.5 V
Input voltage VIN 0 to VCC V
Output voltage VOUT 0 to VCC V
Operating temperature Topr −40 to 85 °C
Input rise and fall time dt/dV 0 to 10 ns/V
Note: The recommended operating conditions are required to ensure the normal operation of the device.
Unused inputs must be tied to either VCC or GND.
TC74ACT240,244P/F/FW/FT
2006-02-01
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Electrical Characteristics
DC Characteristics
Test Condition Ta = 25°C Ta =
−40 to 85°C
Characteristics Symbol
VCC
(V) Min Typ. Max Min Max
Unit
High-level input
voltage VIH ―
4.5
to
5.5
2.0 ― ― 2.0 ― V
Low-level input
voltage VIL ―
4.5
to
5.5
― ― 0.8 ― 0.8 V
High-level output
voltage VOH
VIN
= VIH or
VIL
IOH = −50 µA
IOH = −24 mA
IOH = −75 mA (Note)
4.5
4.5
5.5
4.4
3.94
―
4.5
―
―
―
―
―
4.4
3.80
3.85
―
―
―
V
Low-level output
voltage VOL
VIN
= VIH or
VIL
IOL = 50 µA
IOL = 24 mA
IOL = 75 mA (Note)
4.5
4.5
5.5
―
―
―
0.0
―
―
0.1
0.36
―
―
―
―
0.1
0.44
1.65
V
3-state output
off-state current IOZ
VIN = VIH or VIL
VOUT = VCC or GND
5.5 ― ― ±0.5 ― ±5.0 µA
Input leakage
current IIN VIN = VCC or GND 5.5 ― ― ±0.1 ― ±1.0 µA
ICC VIN = VCC or GND 5.5 ― ― 8.0 ― 80.0 µA
Quiescent supply
current IC
Per input: VIN = 3.4 V
Other input: VCC or GND
5.5 ― ― 1.35 ― 1.5 mA
Note: This spec indicates the capability of driving 50 Ω transmission lines.
One output should be tested at a time for a 10 ms maximum duration.
AC Characteristics (CL = 50 pF, RL = 500 Ω, input: tr = tf = 3 ns)
Test Condition Ta = 25°C Ta =
−40 to 85°C
Characteristics Symbol
VCC (V) Min Typ. Max Min Max
Unit
Propagation delay
time
tpLH
tpHL
― 5.0 ± 0.5 ― 5.7 8.0 1.0 9.0 ns
Output enable time
tpZL
tpZH
― 5.0 ± 0.5 ― 6.0 9.0 1.0 10.5 ns
Output disable time tpLZ
tpHZ
― 5.0 ± 0.5 ― 5.9 8.5 1.0 10.0 ns
Input capacitance CIN ― ― 5 10 ― 10 pF
Output capacitance COUT ― ― 10 ― ― ― pF
TC74ACT240 ― 25 ― ― ―
Power dissipation
capacitance
CPD
(Note) TC74ACT244 ― 29 ― ― ―
pF
Note: CPD is defined as the value of the internal equivalent capacitance which is calculated from the operating
current consumption without load.
Average operating current can be obtained by the equation:
ICC (opr) = CPD·VCC·fIN + ICC/8 (per bit)
TC74ACT240,244P/F/FW/FT
2006-02-01
5
Package Dimensions
Weight: 1.30 g (typ.)
TC74ACT240,244P/F/FW/FT
2006-02-01
6
Package Dimensions
Weight: 0.22 g (typ.)
TC74ACT240,244P/F/FW/FT
2006-02-01
7
Package Dimensions
Weight: 0.22 g (typ.)
TC74ACT240,244P/F/FW/FT
2006-02-01
8
Package Dimensions (Note)
Note: This package is not available in Japan.
Weight: 0.46 g (typ.)
TC74ACT240,244P/F/FW/FT
2006-02-01
9
Package Dimensions
Weight: 0.08 g (typ.)
TC74ACT240,244P/F/FW/FT
2006-02-01
10
Note: Lead (Pb)-Free Packages
DIP20-P-300-2.54A SOP20-P-300-1.27A TSSOP20-P-0044-0.65A
RESTRICTIONS ON PRODUCT USE 060116EBA
• The information contained herein is subject to change without notice. 021023_D
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