AT45D081中文资料(4)

AT45D081

5

HARDWARE PAGE WRITE PROTECT: If the WP pin is held low, the first 256 pages of the main memory cannot be reprogrammed. The only way to reprogram the first 256pages is to first drive the protect pin high and then use the program commands previously mentioned.

RESET: A low state on the reset pin (RESET) will terminate the operation in progress and reset the internal state machine to an idle state. The device will remain in the reset condition as long as a low level is present on the RESET pin. Normal operation can resume once the RESET pin is brought back to a high level.

The device also incorporates an internal power-on reset cir-cuit; therefore, there are no restrictions on the RESET pin during power-on sequences.

READY/BUSY: This open drain output pin will be driven low when the device is busy in an internally self-timed oper-ation. This pin, which is normally in a high state (through an external pull-up resistor), will be pulled low during program-ming operations, compare operations, and during page-to-buffer transfers.

The busy status indicates that the Flash memory array and one of the buffers cannot be accessed; read and write operations to the other buffer can still be performed.

Absolute Maximum Ratings*

Temperature Under Bias ......................-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 All Input Voltages (including NC Pins)

with Respect to Ground.........................-0.6V to +6.25V All Output Voltages

with Respect to Ground...................-0.6V to V CC + 0.6V

DC and AC Operating Range

Note:

1.After power is applied and V CC is at the minimum specified data sheet value, the system should wait 20 ms before an oper-ational mode is started.

AT45D081

Operating Temperature (Case)Com.0°C to 70°C Ind.

-40°C to 85°C V CC Power Supply (1)

4.5V to

5.5V

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AT45D081

6

AC Characteristics

Symbol Parameter Min

Typ

Max Units f SCK SCK Frequency 10

MHz t CS Minimum CS High Time 250ns t CSS CS Setup Time 250ns t CSH CS Hold Time 250ns t WH SCK High Time 40ns t WL SCK Low Time 40ns t SU Data In Setup Time 10ns t H Data In Hold Time 25ns t HO Output Hold Time 0

ns t DIS Output Disable Time 75ns t V Output Valid

80ns t XFR Page to Buffer Transfer/Compare Time 80150µs t EP Page Erase and Programming Time 1020ms t P

Page Programming Time

7

14

ms

DC Characteristics

Symbol Parameter Condition

Min Typ Max Units I SB Standby Current

CS, RESET, WP = V IH , all inputs at CMOS levels

1020µA I CC1Active Current, Read Operation

f = 10 MHz; I OUT = 0 mA; V CC = 5.5V

1525mA I CC2Active Current, Program/Erase Operation 25

50mA I LI Input Load Current V IN = 0V to V CC 10µA I LO Output Leakage Current V I/O = 0V to V CC 10µA V IL Input Low Voltage 0.8

V V IH Input High Voltage 2.0

V V OL Output Low Voltage I OL = 2.1 mA 0.45

V V OH1Output High Voltage I OH = -400 µA

2.4V V OH2

Output High Voltage

I OH = -100 µA; V CC = 4.5V

4.2V

Input Test Waveforms and Measurement Levels

t R , t F < 20 ns (10% to 90%)

AC DRIVING LEVELS

AC

MEASUREMENT LEVEL

0.45V

2.00.8

2.4V

Output Test Load

DEVICE UNDER TEST

30 pF

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