74VHC125 데이터시트 PDF

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74VHC125

QUAD BUS BUFFERS (3-STATE)

s HIGH SPEED: tPD = 3.8ns (TYP.) at VCC = 5V

s LOW POWER DISSIPATION:

ICC = 4 µA (MAX.) at TA=25°C

s HIGH NOISE IMMUNITY:

VNIH = VNIL = 28% VCC (MIN.)

s POWER DOWN PROTECTION ON INPUTS

s SYMMETRICAL OUTPUT IMPEDANCE:

|IOH| = IOL = 8mA (MIN)

s BALANCED PROPAGATION DELAYS:

tPLH ≅ tPHL

s OPERATING VOLTAGE RANGE:

VCC(OPR) = 2V to 5.5V

s PIN AND FUNCTION COMPATIBLE WITH

74 SERIES 125

s IMPROVED LATCH-UP IMMUNITY

s LOW NOISE: VOLP = 0.8V (MAX.)

DESCRIPTION

The 74VHC125 is an advanced high-speed

CMOS QUAD BUS BUFFERS fabricated with

sub-micron silicon gate and double-layer metal

wiring C2MOS technology.

The device requires the 3-STATE control input G

to be set high to place the output in to the high

impedance state.

SOP

TSSOP

Table 1: Order Codes

PACKAGE

SOP

TSSOP

T&R

74VHC125MTR

74VHC125TTR

Power down protection is provided on all inputs

and 0 to 7V can be accepted on inputs with no

regard to the supply voltage. This device can be

used to interface 5V to 3V.

All inputs and outputs are equipped with

protection circuits against static discharge, giving

them 2KV ESD immunity and transient excess

voltage.

Figure 1: Pin Connection And IEC Logic Symbols

November 2004

Rev. 7

1/12

74VHC125

Table 8: Capacitive Characteristics

Test Condition

Value

Symbol

Parameter

CIN

COUT

CPD

Input Capacitance

Output

Capacitance

Power Dissipation

Capacitance

(note 1)

TA = 25°C

-40 to 85°C -55 to 125°C Unit

Min. Typ. Max. Min. Max. Min. Max.

6 10 10 10 pF

8 pF

16 pF

1) CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without

load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. ICC(opr) = CPD x VCC x fIN + ICC/4 (per circuit)

Table 9: Dynamic Switching Characteristics

Test Condition

Value

Symbol

Parameter

VOLP

VOLV

VIHD

VILD

Dynamic Low

Voltage Quiet

Output (note 1, 2)

Dynamic High

Voltage Input

(note 1, 3)

Dynamic Low

Voltage Input

(note 1, 3)

VCC

(V)

5.0

5.0

5.0

CL = 50 pF

TA = 25°C

-40 to 85°C -55 to 125°C Unit

Min. Typ. Max. Min. Max. Min. Max.

0.3 0.8

-0.8 -0.3

V

3.5 V

1.5 V

1) Worst case package.

2) Max number of outputs defined as (n). Data inputs are driven 0V to 5.0V, (n-1) outputs switching and one output at GND.

3) Max number of data inputs (n) switching. (n-1) switching 0V to 5.0V. Inputs under test switching: 5.0V to threshold (VILD), 0V to threshold

(VIHD), f=1MHz.

4/12

DIM.

A

A1

A2

B

C

D

E

e

H

h

L

k

ddd

MIN.

1.35

0.1

1.10

0.33

0.19

8.55

3.8

5.8

0.25

0.4

0°

SO-14 MECHANICAL DATA

mm.

TYP

1.27

MAX.

1.75

0.25

1.65

0.51

0.25

8.75

4.0

6.2

0.50

1.27

8°

0.100

MIN.

0.053

0.004

0.043

0.013

0.007

0.337

0.150

0.228

0.010

0.016

0°

74VHC125

inch

TYP.

0.050

MAX.

0.069

0.010

0.065

0.020

0.010

0.344

0.157

0.244

0.020

0.050

8°

0.004

0016019D

7/12

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