74VHCT244AFT [TOSHIBA]

74VHC Series;


型号：	74VHCT244AFT
厂家：	TOSHIBA
描述：	74VHC Series 驱动光电二极管逻辑集成电路
文件：	总7页 (文件大小：188K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

74VHCT240AFT,74VHCT244AFT

CMOS Digital Integrated Circuits Silicon Monolithic

74VHCT240AFT,74VHCT244AFT

1. Functional Description

•

Octal Bus Buffer

74VHCT240AFT: INVERTED, 3-STATE OUTPUTS

74VHCT244AFT: NON-INVERTED, 3-STATE OUTPUTS

2. General

The 74VHCT240AFT and 74VHCT244AFT 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 74VHCT240AFT is an inverting 3-state buffer having two active-low output enables. The 74VHCT244AFT

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.

The input voltage are compatible with TTL output voltage.

These devices may be used as a level converter for interfacing 3.3 V to 5 V system.

Input protection and output circuit ensure that 0 to 5.5 V can be applied to the input and output (Note) pins

without regard to the supply voltage. These structure prevents device destruction due to mismatched supply and

input/output voltages such as battery back up, hot board insertion, etc.

Note: Output in off-state

3. Features

(1) High speed: Propagation delay time = 6.1 ns (typ.) at VCC = 5 V

(2) Quiescent supply current: ICC = 4 µA (max) at Ta = 25 

(3) Compatible with TTL input: VIL = 0.8 V(max)

VIH = 2.0 V(min)

(4) Power down protection is provided on all inputs and outputs.

(5) Balanced propagation delays: tPLH ≈ tPHL

(6) Low noise: VOLP = 1.0 V (max)

(7) Pin and function compatible with the 74 series

(74ACT/HCT/AHCT etc.) 240/244 type.

4. Packaging

TSSOP20B

2013-02-12

Rev.1.0

74VHCT240AFT,74VHCT244AFT

5. Pin Assignment

74VHCT240AFT

74VHCT244AFT

6. Marking

74VHCT240AFT

74VHCT244AFT

7. IEC Logic Symbol

74VHCT240AFT

74VHCT244AFT

2013-02-12

Rev.1.0

74VHCT240AFT,74VHCT244AFT

8. Truth Table

Input G

Input An

Output Yn

Don't care (L or H)

High impedance

74VHCT244AFT

74VHCT240AFT

Yn:

9. Absolute Maximum Ratings (Note)

Characteristics

Symbol

Note

Rating

Unit

Supply voltage

Input voltage

Output voltage

VCC

VIN

-0.5 to 7.0

-0.5 to VCC + 0.5

-20

VOUT

(Note1)

(Note2)

Input diode current

Output diode current

Output current

IIK

IOK

IOUT

ICC

(Note3)

±20

±25

VCC/ground current

Power dissipation

Storage temperature

±75

180

Tstg

-65 to 150



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

(“HandlingPrecautions”/“DeratingConceptandMethods”)andindividualreliabilitydata(i.e. reliabilitytestreport

and estimated failure rate, etc).

Note1: Output in off-state.

Note2: High (H) or Low (L) state. IOUT absolute maximum rating must be observed.

Note3: VOUT < GND, VOUT > VCC

10. Operating Ranges (Note)

Characteristics

Symbol

Note

Rating

Unit

Supply voltage

Input voltage

Output voltage

VCC

VIN

4.5 to 5.5

0 to 5.5

0 to VCC

-40 to 85

0 to 20

VOUT

(Note1)

(Note2)

Operating temperature

Input rise and fall times

Topr



dt/dv

ns/V

Note: The operating ranges must be maintained to ensure the normal operation of the device.

Unused inputs and bus inputs must be tied to either VCC or GND.

Note1: Output in OFF state.

Note2: High (H) or Low (L) state.

2013-02-12

Rev.1.0

74VHCT240AFT,74VHCT244AFT

11. Electrical Characteristics

11.1. DC Characteristics (Unless otherwise specified, Ta = 25 )

Characteristics

Symbol

Test Condition

VCC (V)

Min

Typ.

Max

Unit

High-level input voltage

Low-level input voltage

High-level output voltage

VIH

VIL



4.5 to 5.5

4.5

2.0



0.8

VOH

VIN = VIH or VIL

IOH = -50 µA

IOH = -8 mA

IOL = 50 µA

IOL = 8 mA

4.40

3.94



4.50



4.5



Low-level output voltage

VOL

IOZ

VIN = VIH or VIL

4.5

0.0



0.10

0.36

±0.25

4.5



3-state output OFF-state

leakage current

VIN = VIH or VIL

VOUT = VCC or GND

5.5



µA

Input leakage current

IIN

ICC

VIN = 5.5 V or GND

VIN = VCC or GND

0 to 5.5

5.5



±0.1

4.0

Quiescent supply

current

ICCT

Per input :VIN = 3.4V

5.5

1.35

Other input:VCC or GND

Output leakage current

(Power-OFF)

IOPD

VOUT = 5.5 V



0.5

µA

11.2. DC Characteristics (Unless otherwise specified, Ta = -40 to 85 )

Characteristics

Symbol

Test Condition

VCC (V)

Min

Max

Unit

High-level input voltage

Low-level input voltage

High-level output voltage

VIH

VIL



4.5 to 5.5

4.5

2.0



0.8

VOH

VIN = VIH or VIL

IOH = -50 µA

IOH = -8 mA

IOL = 50µA

IOL = 8 mA

4.4

3.80



4.5



Low-level output voltage

VOL

IOZ

VIN = VIH or VIL

4.5

0.1

4.5



0.44

±2.50

3-state output OFF-state

leakage current

VIN = VIH or VIL

VOUT = VCC or GND

5.5



µA

Input leakage current

IIN

VIN = 5.5 V or GND

VIN = VCC or GND

0 to 5.5

5.5



±1.0

Quiescent supply

current

ICC

40.0

Quiescent supply

current

ICCT

IOPD

Per input: VIN = 3.4 V,

other input: VCC or GND

5.5



1.50

5.0

Output leakage current

(Power-OFF)

VOUT = 5.5 V

µA

2013-02-12

Rev.1.0

74VHCT240AFT,74VHCT244AFT

11.3. AC Characteristics (Unless otherwise specified, Ta = 25 , Input: tr = tf = 3 ns)

Test

Condition

Characteristics

Part Number

Symbol

Note

VCC (V) CL (pF) Min

Typ.

Max

Unit

Propagation delay time

74VHCT240AFT tPLH,tPHL

74VHCT244AFT tPLH,tPHL

tPZL,tPZH



5.0 ± 0.5



5.6

6.1

5.4

5.9

7.7

8.2

8.8



7.8

8.8

7.4

8.4

10.4

11.4

1.0



3-state output enable time

RL = 1 kΩ 5.0 ± 0.5

3-state output disable time

Output skew

tPLZ,tPHZ

RL = 1 kΩ

5.0 ± 0.5

tosLH,tosHL (Note 1)



Input capacitance

Output capacitance

CIN

COUT



Power dissipation

capacitance

74VHCT240AFT

74VHCT244AFT

CPD

(Note 2)



Power dissipation

capacitance

CPD



Note 1: Parameter guaranteed by design. (tosLH = |tPLHm - tPLHn|, tosHL = |tPHLm - tPHLn|)

Note 2: 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)

11.4. AC Characteristics

(Unless otherwise specified, Ta = -40 to 85 , Input: tr = tf = 3 ns)

Test

Condition

Characteristics

Part Number

Symbol

Note

VCC (V) CL (pF)

Min

Max

Unit

Propagation delay time

74VHCT240AFT tPLH,tPHL

74VHCT244AFT tPLH,tPHL

tPZL,tPZH



5.0 ± 0.5

1.0



9.0

10.0

8.5



9.5

3-state output enable time

RL = 1 kΩ 5.0 ± 0.5

12.0

13.0

1.0

3-state output disable time

Output skew

tPLZ,tPHZ

RL = 1 kΩ 5.0 ± 0.5

tosLH,tosHL (Note 1)

CIN



5.0 ± 0.5

Input capacitance



Note 1: Parameter guaranteed by design. (tosLH = |tPLHm - tPLHn|, tosHL = |tPHLm - tPHLn|)

11.5. Noise Characteristics (Unless otherwise specified, Ta = 25 , Input: tr = tf = 3 ns)

Characteristics

Symbol

Test Condition

VCC (V)

Typ.

Limit

Unit

Quiet output maximum dynamic VOL

Quiet output minimum dynamic VOL

Minimum high-level dynamic input voltage

Maximum low-level dynamic input voltage

VOLP CL = 50 pF

VOLV CL = 50 pF

VIHD CL = 50 pF

5.0

0.8

-0.8



1.0

-1.0

2.0

0.8

VILD

CL = 50 pF



2013-02-12

Rev.1.0

74VHCT240AFT,74VHCT244AFT

Package Dimensions

Unit: mm

Weight: 0.071 g (typ.)

Package Name(s)

Nickname: TSSOP20B

2013-02-12

Rev.1.0

74VHCT240AFT,74VHCT244AFT

RESTRICTIONS ON PRODUCT USE

•

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AS A RESULT OF NONCOMPLIANCE WITH APPLICABLE LAWS AND REGULATIONS.

2013-02-12

Rev.1.0

74VHCT244AFT [TOSHIBA]

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