Philips Semiconductors Linear Products

Product specification

NE590/591

Addressable peripheral drivers

August 31, 1994

523

SWITCHING CHARACTERISTICS

SYMBOL

PARAMETER

TO

FROM

NE590

NE591

UNIT

SYMBOL

PARAMETER

TO

FROM

Min

Typ

Max

Min

Typ

Max

UNIT

Propagation delay time

Output

CE

65

115

150

230

50

70

80

120

ns

Output

Data

65

120

130

240

45

65

70

100

ns

Output

Address

100

130

200

260

45

75

80

140

ns

Output

CLR

65

130

45

140

ns

Output

CS

40

70

80

120

ns

Switching setup requirements

Chip enable

High data

210

100

ns

Chip enable

Low data

210

100

ns

Chip enable

Address

30

30

ns

Chip enable

High data

40

10

ns

Chip enable

Low data

30

10

ns

Chip enable

Low chip select

100

ns

120

120

ns

NOTES:

1. See Turn-On and Turn-Off Delays, Enable to Output and Enable Pulse Width timing diagram.

2. See Turn-On and Turn-Off Delays, Data to Output timing diagram.

3. See Turn-On and Turn-Off Delays, Address to Output timing diagram.

4. See Turn-Off Delay, Clear to Output timing diagram.

5. See Setup and Hold Time, Data to Enable timing diagram.

6. See Setup Time, Address to Enable timing diagram.

FUNCTIONAL DESCRIPTION

These peripheral drivers have latched outputs which hold the input

data until cleared. The NE590 has active-Low, open-collector

outputs, while the NE591 has active-High, uncommitted (open)

emitter outputs. All outputs are cleared when power is first applied.

Addressable Latch Function

Any given output can be turned on or off by presenting the address

of the output to be set or cleared to the three address pins, by

holding the “D” input High to turn on the selected input, or by holding

it Low to turn off, holding the CLR input High, and bringing the CE

input Low. Once an output is turned on or off, it will remain so until

addressed again, or until all outputs are cleared by bringing the

CLR, CE, and “D” inputs Low. For NE591, CS must be brought Low

any time CE is Low if any outputs are to be changed.

Demultiplexer Operation

By bringing the CLR and CE inputs Low and the “D” input High, the

addressed output will remain on and all other outputs will be off. This

condition will remain only as long as the output is addressed. For the

NE591, the CS input must also be Low.

High Current Outputs

The obvious advantage of these devices over the 9334 and

N74LS259 (which provide a similar function) is the fact that the

NE590 and NE591 are capable of output currents of 250mA at each

of their eight outputs. It should be noted, however, that the load

power dissipation would be over 2.5W if all 8 outputs were to carry

their full rated load current at one time. Since the total power

dissipation is limited by the package to 1W, and since the power

dissipation due to supply current is 0.25W, the total load power

dissipation by the device is limited to 0.75W, and decreases as

ambient temperature rises.

The maximum die junction temperature must be limited to 165

°C,

and the temperature rise above ambient and the junction

temperature are defined as:

where

For example, if we are using the NE590 in a plastic package in an

application where the ambient temperature is never expected to rise

above 50

°C, and the output current at the 8 outputs, when on, are

100, 40, 50, 200, 15, 30, 80, and 10mA, we find from the graph of

output voltage vs load current that the output voltages are expected

to be about 0.92, 0.75, 0.78, 1.04, 0.5, 0.7, 0.9, and 0.4V,

respectively. Total device power due to these loads is found to be

473.5mW. Adding the 250mW due to the power supply brings total

device power dissipation to 723.5mW. The thermal resistances are

83

°C per W for plastic packages and 100°C per W for Cerdips.

Using the equations above we find: