Document
Not recommended for new designs – Please use 25AA040A or 25LC040A.
25AA040/25LC040/25C040
4K SPI Bus Serial EEPROM
Device Selection Table
Part Number
VCC Range
Max. Clock Frequency
25AA040 25LC040 25C040
1.8-5.5V 2.5-5.5V 4.5-5.5V
1 MHz 2 MHz 3 MHz
Temp. Ranges
I I I,E
Features:
• Low-power CMOS technology:
- Write current: 3 mA, typical
- Read current: 500 μA, typical
- Standby current: 500 nA, typical
• 512 x 8-bit organization
• 16 byte page
• Write cycle time: 5 ms 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
- Data retention: > 200 years
- ESD protection: > 4000V
• 8-pin PDIP, SOIC and TSSOP packages
• Temperature ranges supported:
- Industrial (I):
-40°C to +85°C
- Automotive (E) (25C040): -40°C to +125°C
Description:
The Microchip Technology Inc. 25AA040/25LC040/ 25C040 (25XX040*) is a 4 Kbit serial Electrically Erasable 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.
*25XX040 is used in this document as a generic part number for the 25AA040/25LC040/25C040 devices.
Communication to the device can be paused via the hold pin (HOLD). While the device is paused, transitions on its inputs will be ignored, with the exception of Chip Select, allowing the host to service higher priority interrupts. Also, write operations to the device can be disabled via the write-protect pin (WP).
Package Types
PDIP CS 1
8 VCC
25XX040
SO 2 WP 3
7 HOLD 6 SCK
VSS 4
5 SI
SOIC
CS 1 SO 2 WP 3 VSS 4
TSSOP
HOLD VCC
CS
SO
1 2 3 4
25XX040
25XX040
8 VCC 7 HOLD 6 SCK 5 SI
8 SCK 7 SI 6 VSS 5 WP
Block Diagram
STATUS Register
HV Generator
I/O Control Logic
Memory Control Logic
XDEC
EEPROM Array
Page Latches
SI SO CS SCK HOLD WP
VCC VSS
Y Decoder
Sense Amp. R/W Control
© 2006 Microchip Technology Inc.
DS21204E-page 1
25AA040/25LC040/25C040
1.0 ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings(†)
VCC.............................................................................................................................................................................7.0V All inputs and outputs w.r.t. VSS .......................................................................................................... -0.6V to VCC+1.0V Storage temperature .................................................................................................................................-65°C to 150°C Ambient temperature under bias ...............................................................................................................-65°C to 125°C ESD protection on all pins ......................................................................................................................................... 4 KV
† NOTICE: 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 those or any other conditions above those indicated in the operational listings of this specification is not implied. Exposure to maximum rating conditions for an extended period of time may affect device reliability
TABLE 1-1: DC CHARACTERISTICS
DC CHARACTERISTICS
Industrial (I): TA = -40°C to +85°C VCC = 1.8V to 5.5V Automotive (E): TA = -40°C to +125°C VCC = 4.5V to 5.5V (25C040 only)
Param. No.
Sym.
Characteristic
Min.
Max. Units
Test Conditions
D001 D002 D003 D004 D005 D006 D007
VIH1 VIH2 VIL1 VIL2 VOL VOL VOH
D008 D009
ILI ILO
High-level input voltage
Low-level input voltage
Low-level output voltage
High-level output voltage Input leakage current Output leakage current
2.0 0.7 VCC
-0.3 -0.3 — — VCC -0.5
— —
VCC+1 VCC+1
0.8 0.3 VCC
0.4 0.2 —
±1 ±1
V VCC ≥ 2.7V (Note) V VCC< 2.7V (Note) V VCC ≥ 2.7V (Note) V VCC < 2.7V (Note) V IOL = 2.1 mA V IOL = 1.0 mA, VCC < 2.5V V IOH =-400 μA
μA CS = VCC, VIN = VSS TO VCC μA CS = VCC, VOUT = VSS TO VCC
D010 D011
CINT
Internal Capacitance (all inputs and outputs)
ICC Read Operating Current
D012 ICC Write
D013 ICCS
Standby Current
—
— — — — — —
7 pF
1 mA 500 μA
5 mA 3 mA 5 μA 1 μA
Note: This parameter is periodically sampled and not 100% tested.
TA = 25°C, CLK = 1.0 MHz, VCC = 5.0V (Note)
VCC = 5.5V; FCLK = 3.0 MHz; SO = Open VCC = 2.5V; FCLK = 2.0 MHz; SO = Open VCC = 5.5V VCC = 2.5V CS = VCC = 5.5V, Inputs tied to VCC or VSS CS = VCC = 2.5V, Inputs tied to VCC or VSS
DS21204E-page 2
© 2006 Microchip Technology Inc.
25AA040/25LC040/25C040
TABLE 1-2: AC CHARACTERISTICS
AC CHARACTERISTICS
Industrial (I): TA = -40°C to +85°C Automotive (E): TA = -40°C to +125°C
VCC.