AT93C46/56/57/66

2

The AT93C46/56/57/66 is enabled through the Chip Select

pin (CS), and accessed via a 3-wire serial interface consist-

ing of Data Input (DI), Data Output (DO), and Shift Clock

(SK). Upon receiving a READ instruction at DI, the address

is decoded and the data is clocked out serially on the data

output pin DO. The WRITE cycle is completely self-timed

and no separate ERASE cycle is required before WRITE.

The WRITE cycle is only enabled when the part is in the

ERASE/WRITE ENABLE state. When CS is brought “high”

following the initiation of a WRITE cycle, the DO pin out-

puts the READY/BUSY status of the part.

The AT93C46 is available in 4.5V to 5.5V, 2.7V to 5.5V,

2. 5V to 5. 5V, and 1 . 8V to 5. 5V ver sions. T h e

AT93C56/57/66 is available in 4.5V to 5.5V, 2.7V to 5.5V,

and 2.5V to 5.5V versions.

Block Diagram

Note:

1.

When the ORG pin is connected to V

tion is selected. If the ORG pin is left unconnected, then an internal pullup device (of approximately 1 M

Ω) will select the x

16 organization. This feature is not available on 1.8V devices.

Absolute Maximum Ratings*

Operating Temperature .................................. -55

°C to +125°C

*NOTICE:

Stresses beyond those listed under “Absolute

Maximum Ratings” may cause permanent dam-

age to the device. This is a stress rating only and

functional operation of the device at these or any

other conditions beyond those indicated in the

operational sections of this specification is not

implied. Exposure to absolute maximum rating

conditions for extended periods may affect

device reliability

Storage Temperature ..................................... -65

°C to +150°C

Voltage on Any Pin

with Respect to Ground .....................................-1.0V to +7.0V

Maximum Operating Voltage........................................... 6.25V

DC Output Current........................................................ 5.0 mA