25C640资料
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©
1997 Microchip Technology Inc.
Preliminary
DS21223A-page 1 M
25AA640/25LC640/25C640
DEVICE SELECTION TABLE
FEATURES
•Low power CMOS technology
-Write current: 3 mA typical
-Read current: 500
µ
A typical
-Standby current: 500 nA typical
•8192 x 8 bit organization
•32 byte page
•Write cycle time: 5ms max.
•Self-timed ERASE and WRITE cycles
•Block write protection
-Protect none, 1/4, 1/2, or all of array
•Built-in write protection
-Power on/off data protection circuitry
-Write enable latch
-Write protect pin
•Sequential read
•High reliability
-Endurance: 1M cycles (guaranteed)
-Data retention: > 200 years
-ESD protection: > 4000 V
•8-pin PDIP, SOIC, and TSSOP packages
•Temperature ranges supported:
DESCRIPTION
The Microchip Technology Inc. 25AA640/25LC640/
25C640 (25xx640
*
) is a 64K bit serial Electrically Eras-
able PROM. The memory is accessed via a simple
Serial Peripheral Interface (SPI) compatible serial bus.
The bus signals required are a clock input (SCK) plus
separate data in (SI) and data out (SO) lines. Access to
the device is controlled through a chip select (CS) input.
Communication to the device can be paused via the
hold pin (HOLD). While the device is paused, transi-
tions on its inputs will be ignored, with the exception of
chip select, allowing the host to service higher priority
interrupts.
PACKAGE TYPES
BLOCK DIAGRAM
Part
NumberV
CC
RangeMax Clock
FrequencyTemp
Ranges
25AA6401.8-5.5V1 MHzC,I
25LC6402.5-5.5V2 MHzC,I
25C6404.5-5.5V3 MHzC,I,E
-Commercial: (C)0
°
Cto+70
°
C-Industrial: (I)-40
°
Cto+85
°
C-Automotive: (E) (25C640)-40
°
Cto+125
°
C25xx640TSSOP
1
2
3
48
7
6
5SCK
SI
VSS
WPHOLD
VCC
CS
SO25xx640PDIP/SOIC
1
2
3
48
7
6
5VCC
HOLD
SCK
SICS
SO
WP
VSS
SI
SO
SCKCS
HOLD
WPStatusRegister
I/O ControlMemoryControlLogicX
DecHV Generator
EEPROM
Array
Page Latches
Y Decoder
Sense Amp.R/W ControlLogic
VCCVSS
64K SPI
™
Bus Serial EEPROM
*25xx640 is used in this document as a generic part number for the 25AA640/25LC640/25C640 devices.SPI is a trademark of Motorola.元器件交易网www.cecb2b.com 25AA640/25LC640/25C640
DS21223A-page 2
Preliminary
©
1997 Microchip Technology Inc.
1.0ELECTRICAL
CHARACTERISTICS
1.1Maximum Ratings*
Vcc...................................................................................7.0VAll inputs and outputs w.r.t. Vss..................-0.6V to Vcc+1.0VStorage temperature.......................................-65˚C to 150˚CAmbient temperature under bias.....................-65˚C to 125˚CSoldering temperature of leads (10 seconds).............+300˚CESD protection on all pins.................................................4kV
*Notice:
Stresses above those listed under ‘Maximum ratings’ maycause permanent damage to the device. This is a stress rating only andfunctional operation of the device at those or any other conditionsabove those indicated in the operational listings of this specification isnot implied. Exposure to maximum rating conditions for an extendedperiod of time may affect device reliability
TABLE 1-1:PIN FUNCTION TABLEFIGURE 1-1:AC TEST CIRCUIT
1.2AC Test Conditions
NameFunction
CSChip Select Input
SOSerial Data Output
SISerial Data Input
SCKSerial Clock Input
WPWrite Protect Pin
V
SS
Ground
V
CC
Supply Voltage
HOLDHold InputAC Waveform:
V
LO
= 0.2V
V
HI
= V
CC
- 0.2V (Note 1)
V
HI
= 4.0V (Note 2)
Timing Measurement Reference Level
Input0.5 V
CC
Output0.5 V
CC
Note 1:
For V
CC
≤
4.0V
2:
For V
CC
> 4.0VVCC
SO
100 pF1.8 K2.25 K
TABLE 1-2:DC CHARACTERISTICS All parameters apply over the specified operating ranges unless otherwise noted.Commercial (C): Tamb = 0
°
C to +70
°
C
V
CC
= 1.8V to 5.5VIndustrial (I): Tamb = -40
°
C to +85
°
C V
CC
= 1.8V to 5.5VAutomotive (E): Tamb = -40
°
C to +125
°
C V
CC
= 4.5V to 5.5V (25C640 only)
ParameterSymbolMinMaxUnitsTest Conditions
High level input voltageV
IH
12.0V
CC
+1VV
CC
≥
2.7V (Note)
V
IH
20.7 V
CC
V
CC
+1VV
CC
< 2.7V (Note)
Low level input voltageV
IL
1-0.30.8VV
CC
≥
2.7V (Note)
V
IL
2-0.30.3 V
CC
VV
CC
< 2.7V (Note)
Low level output voltageV
OL
—0.4VI
OL
= 2.1 mA
V
OL
—0.2VI
OL
= 1.0 mA, V
CC
< 2.5V
High level output voltageV
OH
V
CC
-0.5—VI
OH
=-400
µ
A
Input leakage currentI
LI
-1010
µ
ACS = V
CC
, V
IN
= V
SS
TO
V
CC
Output leakage currentI
LO
-1010
µ
ACS = V
CC
, V
OUT
= V
SS
TO
V
CC
Internal Capacitance
(all inputs and outputs)C
INT
—7pFT
AMB
= 25˚C, CLK = 1.0 MHz,
V
CC
= 5.0V (Note)
Operating CurrentI
CC
Read—
—1
500mA
µ
AV
CC
= 5.5V; F
CLK
=3.0 MHz; SO = Open
V
CC
= 2.5V; F
CLK
=2.0 MHz; SO = Open
I
CC
Write—
—5
3mA
mAV
CC
= 5.5V
V
CC
= 2.5V
Standby CurrentI
CCS
—
—5
1
µ
A
µ
ACS = Vcc = 5.5V, Inputs tied to V
CC
or V
SS
CS = Vcc = 2.5V, Inputs tied to V
CC
or V
SS
Note:
This parameter is periodically sampled and not 100% tested.元器件交易网www.cecb2b.com
