74AVC16836ADGV 데이터 시트보기 (PDF) - Philips Electronics

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74AVC16836ADGV

20-bit registered driver with inverted register enable and Dynamic Controlled Outputs™ (3-State)

Philips Electronics 

Philips Semiconductors

20-bit registered driver with inverted register enable

and Dynamic Controlled Outputs™ (3-State)

Product data

74AVC16836A

TEST CIRCUIT

VCC

PULSE

GENERATOR

VI

RT

VO

D.U.T.

CL

S1

2 * VCC

Open

GND

RL

RL

Test Circuit for switching times

DEFINITIONS

RL = Load resistor

CL = Load capacitance includes jig and probe capacitance

RT = Termination resistance should be equal to ZOUT of pulse generators.

SWITCH POSITION

TEST

S1

VCC

VI

RL

tPLH/tPHL

Open

< 2.3 V

VCC

1000 Ω

tPLZ/tPZL

tPHZ/tPZH

2 < VCC

GND

2.3–2.7 V

3.0 V

VCC

VCC

500 Ω

500 Ω

SV01018

Waveform 7. Load circuitry for switching times

GRAPHS

3.5

3

2.5

2

1.5

1

0.5

0

0

VCC = 3.3 V

VCC = 1.8 V

VCC = 2.5 V

50

100

150

200

250

I OL OUTPUT CURRENT (mA)

SH00204

Figure 1. Output voltage (VOL) vs. output current (IOL)

3.5

3.0

2.5

2.0

1.5

1.0

0.5 VCC = 3.3 V

VCC = 2.5 V

VCC= 1.8 V

0.0

–250

–200

–150

–100

–50

0

I OH OUTPUT CURRENT (mA)

SH00205

Figure 2. Output voltage (VOH) vs. output current (IOH)

A Dynamic Controlled Output (DCO) circuit is designed in. During

the transition, it initially lowers the output impedance to effectively

drive the load and, subsequently, raises the impedance to reduce

noise. Figures 1 and 2 show VOL vs. IOL and VOH vs. IOH curves to

illustrate the output impedance and drive capability of the circuit. At

the beginning of the signal transition, the DCO circuit provides a

maximum dynamic drive that is equivalent to a high drive standard

output device.

2002 Aug 02

8

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