SCN2681T Просмотр технического описания (PDF) - Philips Electronics

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SCN2681T

Dual asynchronous receiver/transmitter (DUART)

Philips Electronics 

Philips Semiconductors

Dual asynchronous receiver/transmitter (DUART)

Product specification

SCN2681T

ABSOLUTE MAXIMUM RATINGS1

SYMBOL

PARAMETER

RATING

UNIT

TA

TSTG

Operating ambient temperature range2

Storage temperature range

All voltages with respect to GND3

0 to +70

°C

-65 to +150

°C

-0.5 to +6.0

V

NOTES:

1. Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and

functional operation of the device at these or any other conditions above those indicated in the operation section of this specification is not

implied.

2. For operating at elevated temperatures, the device must be derated based on +150°C maximum junction temperature.

3. This product includes circuitry specifically designed for the protection of its internal devices from damaging effects of excessive static

charge. Nonetheless, it is suggested that conventional precautions be taken to avoid applying any voltages larger than the rated maxima.

DC ELECTRICAL CHARACTERISTICS1, 2, 3

SYMBOL

PARAMETER

TEST CONDITIONS

LIMITS

Min Typ Max

UNIT

VIL

Input low voltage

VIH

Input high voltage (except X1/CLK)

VIH

Input high voltage (X1/CLK)

0.8

2.0

V

3.5

VOL

Output low voltage

VOH

Output high voltage (except o.c. outputs)4

IOL = 2.4mA

IOH = -400µA

0.4

2.4

V

IIL

Input leakage current

ILL

Data bus 3-state leakage current

VIN = 0 to VCC

VO = 0.4 to VCC

-10

10

-10

10

µA

IX1L

X1/CLK low input current

IX1H

X1/CLK high input current

IX2L

X2 low input current

IX2H

X2 high input current

VIN = 0, X2 grounded

VIN = 0, X2 floated

VIN = VCC, X2 = grounded

VIN = VCC, X2 floated

VIN = 0, X1/CLK floated

VIN = VCC, X1/CLK floated

-4

-2

0

mA

-3

-1.5

0

mA

-1

0.2

1

mA

0

3.5

10

mA

-100 -30

0

µA

0

+30 100

µA

IOC

Open-collector output leakage current

VO = 0.4 to VCC

-10

10

µA

ICC

Power supply current5

150 mA

NOTES:

1. Parameters are valid over specified temperature range. See Ordering information table for applicable operating temperature range and VCC

supply range.

2. All voltage measurements are referenced to ground (GND). For testing, all inputs except X1/CLK swing between 0.4V and 2.4V with a

transition time of 20ns maximum. For X1/CLK this swing is between 0.4V and 4.0V. All time measurements are referenced at input voltages

of 0.8V and 2.0V and output voltages of 0.8V and 2.0V as appropriate.

3. Typical values are at +25°C, typical supply voltages, and typical processing parameters.

4. Test conditions for outputs: CL = 150pF, except interrupt outputs. Test conditions for interrupt outputs: CL = 50pF, RL = 2.7kΩ to VCC.

5. For bus operations, CEN and RDN (also CEN and WRN) are ANDed internally. As a consequence, the signal asserted last initiates the cycle

and the signal negated first terminates the cycle.

AC ELECTRICAL CHARACTERISTICS1, 2, 3, 4

RESET

tRES

SD00028

Figure 3. Reset Timing

NOTES:

1. Parameters are valid over specified temperature range. See Ordering information table for applicable operating temperature range and VCC

supply range.

2. All voltage measurements are referenced to ground (GND). For testing, all inputs except X1/CLK swing between 0.4V and 2.4V with a

transition time of 20ns maximum. For X1/CLK this swing is between 0.4V and 4.0V. All time measurements are referenced at input voltages

of 0.8V and 2.0V and output voltages of 0.8V and 2.0V as appropriate.

3. Typical values are at +25°C, typical supply voltages, and typical processing parameters.

4. Test conditions for outputs: CL = 150pF, except interrupt outputs. Test conditions for interrupt outputs: CL = 50pF, RL = 2.7kΩ to VCC.

1998 Sep 04

6

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