Document
TC74VHC240,244F/FW/FT/FK
TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic
TC74VHC240F,TC74VHC240FW,TC74VHC240FT,TC74VHC240FK TC74VHC244F,TC74VHC244FW,TC74VHC244FT,TC74VHC244FK
Octal Bus Buffer TC74VHC240F/FW/FT/FK Inverted, 3-State Outputs TC74VHC244F/FW/FT/FK Non-Inverted, 3-State Outputs
Note: xxxFW (JEDEC SOP) is not available in Japan.
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 = 0.9 V (max) • Pin and function compatible with 74ALS240/244
TC74VHC240FW, TC74VHC244FW TC74VHC240FT, TC74VHC244FT
TC74VHC240FK, TC74VHC244FK
Weight
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.)
VSSOP20-P-0030-0.50 : 0.03 g (typ.)
1 2006-02-01
Pin Assignment
1G 1 1A1 2 2Y4 3 1A2 4 2Y3 5 1A3 6 2Y2 7 1A4 8 2Y1 9 GND 10
TC74VHC240 (top view)
Iec Logic Symbol
20 VCC 19 2G 18 1Y1 17 2A4 16 1Y2 15 2A3 14 1Y3 13 2A2 12 1Y4 11 2A1
1G (1) 1A1 (2) 1A2 (4) 1A3 (6) 1A4 (8)
TC74VHC240 EN
(18) 1Y1 (16) 1Y2 (14) 1Y3 (12) 1Y4
2G (19) EN 2A1 (11) 2A2 (13) 2A3 (15) 2A4 (17)
Truth Table
Inputs G An LL LH HX
Outputs Yn Yn LH HL ZZ
X: Don’t care Z: High impedance Yn: TC74VHC244 Yn : TC74VHC240
(9) 2Y1 (7) 2Y2 (5) 2Y3 (3) 2Y4
TC74VHC240,244F/FW/FT/FK
1G 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 2G 18 1Y1 17 2A4 16 1Y2 15 2A3 14 1Y3 13 2A2 12 1Y4 11 2A1
1G (1) 1A1 (2) 1A2 (4) 1A3 (6) 1A4 (8)
TC74VHC244 EN
(18) 1Y1 (16) 1Y2 (14) 1Y3 (12) 1Y4
2G (19) EN 2A1 (11) 2A2 (13) 2A3 (15) 2A4 (17)
(9) 2Y1 (7) 2Y2 (5) 2Y3 (3) 2Y4
2 2006-02-01
TC74VHC240,244F/FW/FT/FK
Absolute Maximum Ratings (Note)
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 −0.5 to 7.0 −0.5 to VCC + 0.5
−20 ±20 ±25 ±75 180 −65 to 150
V V V mA mA mA mA mW °C
Note: Exceeding any of the absolute maximum ratings, even briefly, lead to deterioration in IC performance or even destruction.
Recommended Operating Conditions (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 recommended operating conditions are required to ensure the normal operation of the device. Unused inputs must be tied to either VCC or GND.
3 2006-02-01
TC74VHC240,244F/FW/FT/FK
Electrical Characteristics DC Characteristics
Characteristics
Symbol
High-level input voltage
Low-level input voltage
VIH VIL
Test Condition ⎯ ⎯
High-level output voltage
Low-level output voltage
3-state output off-state current Input leakage current Quiescent supply current
VOH
VIN = VIH or VIL
IOH = −50 µA IOH = −4 mA
IOH = −8 mA
IOL = 50 µA
VOL
VIN = VIH or VIL
IOL = 4 mA
IOL = 8 mA
IOZ
VIN = VIH or VIL VOUT = VCC or GND
IIN VIN = 5.5 V or GND
ICC VIN = VCC or GND
Ta = 25°C VCC (V) Min Typ. Max
Ta = −40 to 85°C
Min Max
2.0
3.0 to 5.5
1.50 VCC ×
0.7
⎯ ⎯
⎯ 1.50 ⎯
⎯
VCC × 0.7
⎯
2.0
3.0 to 5.5
⎯ ⎯
⎯ 0.50 ― 0.50
⎯
VCC × 0.3
―
VCC × 0.3
2.0 1.9 2.0 ⎯ 1.9 ⎯
3.0 2.9 3.0 ⎯ 2.9 ⎯
4.5 4.4 4.5 ⎯ 4.4 ⎯
3.0 2.58 ⎯
⎯ 2.48 ⎯
4.5 3.94 ⎯
⎯ 3.80 ⎯
2.0 ⎯ 0.0 0.1 ⎯ 0.1
3.0 ⎯ 0.0 0.1 ⎯ 0.1
4.5 ⎯ 0.0 0.1 ⎯ 0.1
3.0 ⎯ ⎯ 0.36 ⎯ 0.44
4.5 ⎯ ⎯ 0.36 ⎯ 0.44
Unit V V V
V
5.5 ⎯ ⎯ ±0.25 ⎯ ±2.50 µA
0 to 5.5 ⎯ 5.5 ⎯
⎯ ±0.1 ⎯ ±1.0 µA ⎯ 4.0 ⎯ 40.0 µA
4 2006-02-01
TC74VHC240,244F/FW/FT/FK
AC Characteristics (input: tr = tf = 3 ns)
Characteristics
Propagation delay time (TC74VHC240)
Propagation delay time (TC74VHC244)
3-state output enable time
3-state output disable time
Output to output skew Input c.