Document
TC74VHC240,244F/FK
TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic
TC74VHC240F, TC74VHC240FK TC74VHC244F, TC74VHC244FK
Octal Bus Buffer TC74VHC240F/FK Inverted, 3-State Outputs TC74VHC244F/FK Non-Inverted, 3-State Outputs
TC74VHC240F, TC74VHC244F
The TC74VHC240 and 244 are advanced high speed CMOS OCTAL BUS BUFFERs fabricated with silicon gate C2MOS technology.
They achieve the high speed operation similar to equivalent Bipolar Schottky TTL while maintaining the CMOS low power dissipation.
The 74VHC240 is an inverting 3-state buffer having two active-low output enables. The TC74VHC244 is a non-inverting 3-state buffer, and has two active-low output enables.
These devices are designed to be used with 3-state memory address drivers, etc.
An input protection circuit ensures that 0 to 5.5 V can be applied to the input pins without regard to the supply voltage. This device can be used to interface 5 V to 3 V systems and two supply systems such as battery back up. This circuit prevents device destruction due to mismatched supply and input voltages.
Features
High speed: tpd = 3.9 ns (typ.) at VCC = 5 V Low power dissipation: ICC = 4 µA (max) at Ta = 25°C High noise immunity: VNIH = VNIL = 28% VCC (min) Power down protection is provided on all inputs. Balanced propagation delays: tpLH ∼− tpHL Wide operating voltage range: VCC (opr) = 2 to 5.5 V Low noise: VOLP = 0.8 V (max) Pin and function compatible with 74ALS240/244
TC74VHC240FK, TC74VHC244FK
Weight SOP20-P-300-1.27A VSSOP20-P-0030-0.50
: 0.22 g (typ.) : 0.03 g (typ.)
© 2019
1
Toshiba Electronic Devices & Storage Corporation
Start of commercial production
1991-05
2019-01-31
Pin Assignment
1 1A1 2
3 1A2 4
5 1A3 6
7 1A4 8
9 GND 10
TC74VHC240 (top view)
20 VCC 19 18 17 2A4 16 15 2A3 14 13 2A2 12 11 2A1
IEC Logic Symbol
TC74VHC240 (1) EN
1A1 (2)
(18)
1A2 (4)
(16)
1A3 (6)
(14)
1A4 (8)
(12)
(19) EN
2A1 (11)
(9)
2A2 (13)
(7)
2A3 (15)
(5)
2A4 (17)
(3)
Truth Table
Inputs
G
An
L
L
L
H
H
X
Outputs
Yn
Yn
L
H
H
L
Z
Z
X: Don’t care Z: High impedance Yn: TC74VHC244 Yn : TC74VHC240
© 2019 Toshiba Electronic Devices & Storage Corporation
TC74VHC240,244F/FK
1 1A1 2 2Y4 3 1A2 4 2Y3 5 1A3 6 2Y2 7 1A4 8 2Y1 9 GND 10
TC74VHC244 (top view)
20 VCC 19 18 1Y1 17 2A4 16 1Y2 15 2A3 14 1Y3 13 2A2 12 1Y4 11 2A1
(1) 1A1 (2) 1A2 (4) 1A3 (6) 1A4 (8)
TC74VHC244 EN
(18) 1Y1 (16) 1Y2 (14) 1Y3 (12) 1Y4
(19) EN 2A1 (11) 2A2 (13) 2A3 (15) 2A4 (17)
(9) 2Y1 (7) 2Y2 (5) 2Y3 (3) 2Y4
2
2019-01-31
Absolute Maximum Ratings (Note)
TC74VHC240,244F/FK
Characteristics
Symbol
Rating
Unit
Supply voltage range DC input voltage DC output voltage Input diode current Output diode current DC output current DC VCC/ground current Power dissipation Storage temperature
VCC VIN VOUT IIK IOK IOUT ICC PD Tstg
−0.5 to 7.0
V
−0.5 to 7.0
V
−0.5 to VCC + 0.5
V
−20
mA
±20
mA
±25
mA
±75
mA
180
mW
−65 to 150
°C
Note:
Exceeding any of the absolute maximum ratings, even briefly, lead to deterioration in IC performance or even destruction. Using continuously under heavy loads (e.g. the application of high temperature/current/voltage and the significant change in temperature, etc.) may cause this product to decrease in the reliability significantly even if the operating conditions (i.e. operating temperature/current/voltage, etc.) are within the absolute maximum ratings and the operating ranges. Please design the appropriate reliability upon reviewing the Toshiba Semiconductor Reliability Handbook (“Handling Precautions”/“Derating Concept and Methods”) and individual reliability data (i.e. reliability test report and estimated failure rate, etc).
Operating Ranges (Note)
Characteristics
Symbol
Rating
Unit
Supply voltage Input voltage Output voltage Operating temperature
Input rise and fall time
VCC VIN VOUT Topr
dt/dv
2.0 to 5.5 0 to 5.5 0 to VCC −40 to 85 0 to 100 (VCC = 3.3 ± 0.3 V) 0 to 20 (VCC = 5 ± 0.5 V)
V V V °C
ns/V
Note: The operating ranges must be maintained to ensure the normal operation of the device. Unused inputs must be tied to either VCC or GND.
© 2019
3
Toshiba Electronic Devices & Storage Corporation
2019-01-31
Electrical Characteristics
TC74VHC240,244F/FK
DC Characteristics
Characteristics
Symbol
High-level input voltage
VIH
Low-level input voltage
VIL
High-level output voltage
VOH
Low-level output voltage
VOL
3-state output offstate current
IOZ
Input leakage current
IIN
Quiescent supply current
ICC
Test Condition
Ta = 25°C
Ta = −40 to 85°C Unit
VCC (V) Min Typ. Max Min Max
2.0
1.50
1.50
3.0 to 5.5
VCC × 0.7
VCC × 0.7
V
2.0
3.0 to 5.5
2.0
IOH = −50 µA
3.0
VIN
4.5
= VIH or VIL
IOH = −4 mA
3.0
IOH = −8 mA
4.5
2.0
IOL = 50 µA
3.0
VIN
4.5
= VIH or VIL
IOL = 4 mA
3.0
IOL = 8 mA
4.5
VIN = VIH or VIL
5.5
VOUT = VCC or GND
1.9 .