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PDF BR9020 Data sheet ( Hoja de datos )
| Número de pieza | BR9020 | |
| Descripción | 1/ 2/ and 4k bit EEPROMs for direct connection to serial ports | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de BR9020 (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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Memory ICs
1, 2, and 4k bit EEPROMs for direct
connection to serial ports
BR9010 / BR9010F / BR9010FV / BR9020 /
BR9020F / BR9040 / BR9040F
•Features
•BR9010 / F / FV (1k bit): 64 words × 16 bits
BR9020 / F (2k bit): 128 words × 16 bits
BR9040 / F (4k bit): 256 words × 16 bits
•Single power supply operation
•Serial data input and output
•Automatic erase-before-write
•Low current consumption
–1.5mA (max.) active current: 3V
–2µA (max.) standby current: 3V
•Noise filter built into SK pin
•Compact DIP8, SOP8, SSOP-B8 packages (SSOP-
B8 is available only with BR9010).
•100,000 ERASE / WRITE cycles
•10 years Data Retention
•Easily connects to serial port
•Pin assignments
CS 1
8 VCC R / B∗ 1
8 WC
SK 2 BR9010 /
7
BR9020 / 9040
DI 3
6
R / B∗ VCC 2
WC CS 3
DO 4
5 GND SK 4
BR9010F /
BR9010FV /
BR9020F /
BR9040F
7
6
5
GND
DO
DI
∗ This pin is N.C. (non connection) on BR9010.
•Pin description
Pin
name
CS
SK
DI
DO
GND
WC
R /B
VCC
Function
Chip select input
Serial data clock input
Operating code, address, and serial data input
Serial data output
Reference voltage for all I / O, 0V
Write control input
READY, BUSY status signal output
Power supply connection
•Overview
The BR90 series are serial EEPROMs that can be connected directly to a serial port and can be erased and written
electrically. Writing and reading is performed in word units, using four types of operation commands. Communication
occurs through CS, SK, DI, and DO pins, WC pin control is used to initiate a write disabled state, enabling these
EEPROMs to be used as one-time ROMs. During writing, operation is checked via the internal status check.
1
1 page  
Memory ICs
BR9010 / BR9010F / BR9010FV / BR9020 / BR9020F /
BR9040 / BR9040F
Electrical characteristics
••BR9020 / F: At 5V (unless otherwise noted, Ta = – 40 to + 85°C, VCC = 5V ± 10%)
Parameter
Symbol Min. Typ. Max. Unit
Conditions
Input low level voltage 1
VIL1
— — 0.3 × VCC V DI Pin
Input high level voltage 1
VIH1 0.7 × VCC —
—
V DI Pin
Input low level voltage 2
VIL2
— — 0.2 × VCC V CS, SK, WC Pin
Input high level voltage 2
VIH2 0.8 × VCC —
—
V CS, SK, WC Pin
Output low level voltage
VOL
0 — 0.4 V IOL = 2.1mA
Output high level voltage
VOH VCC – 0.4 —
VCC
V IOH = – 0.4mA
Input leak current
ILI – 1 — 1 µA VIN = 0V ~ VCC
Output leak current
ILO – 1 — 1 µA VOUT = 0V ~ VCC CS = VCC
Consumption current
during operation
ICC1 — — 2 mA fSK = 1MHz tE / W = 10ms (WRITE)
ICC2 — — 1 mA fSK = 1MHz (READ)
Standby current
ISB — — 3 µA CS, SK, DI, WC, = VCC DO, R / B = OPEN
SK frequency
fSK — — 1 MHz
—
•BR9020 / F: At 3V (unless otherwise noted, Ta = – 40 to + 85°C, VCC = 3V ± 10%)
Parameter
Symbol Min.
Typ. Max.
Unit
Conditions
Input low level voltage 1
VIL1
— — 0.3 × VCC V DI Pin
Input high level voltage 1
VIH1 0.7 × VCC —
—
V DI Pin
Input low level voltage 2
VIL2
— — 0.2 × VCC V CS, SK, WC Pin
Input high level voltage 2
VIH2 0.8 × VCC —
—
V CS, SK, WC Pin
Output low level voltage
VOL
0 — 0.4 V IOL = 100µA
Output high level voltage
VOH VCC – 0.4 —
VCC
V IOH = – 100µA
Input leak current
ILI – 1 — 1 µA VIN = 0V ~ VCC
Output leak current
ILO – 1 — 1 µA VOUT = 0V ~ VCC CS = VCC
Consumption current
during operation
ICC1 — — 1.5 mA fSK = 1MHz tE / W = 15ms (WRITE)
ICC2 — — 500 µA fSK = 1MHz (READ)
Standby current
ISB — — 2 µA CS, SK, DI, WC, = VCC DO, R / B = OPEN
SK frequency
fSK
——
1 MHz
—
5
5 Page 
Memory ICs
(2) Timing chart
CS
SK
DI
DO
BR9010 / BR9010F / BR9010FV / BR9020 / BR9020F /
BR9040 / BR9040F
tCSS
tWL
tDIS
tPD
tWH
tDIH
tPD
tCS
tCSH
tOH
WC
• Data is read in on the rising edge of SK. Data is output in synchronism with the SK falling edge.
• During a READ operation, data is output from DO in synchronization with the SK rise.
• WC is related to the write command only. Read, erase / write enable, erase / write disable commands can be executed irrespective of the state of WC.
(3) Writing enabled / disabled
H
SK L
1
4
H
CS L
8 12
ENABLE = 1 1
DISABLE = 0 0
16
H
DI
L
10100 0
High-Z
DO
H
R/B
WC H or L
Fig.1
1) When the power supply is turned on, the latch used to acknowledge writing is reset in the same way as when the
write disable command is executed. Before entering the write mode, the write enabled mode must first be entered.
Once the write enabled mode has been recognized, it remains valid until the write disabled mode is entered, or
the power supply is turned off.
2) The clock is no longer necessary after the first 16 clock pulses have been received. Any subsequent input will be
ignored.
3) WC does not exist for either the write enabled or write disabled command, so WC may be either HIGH or LOW
when the command is being input.
4) Commands are received in these modes by means of 8-bit operating codes. Please be aware that, after an oper-
ating code has been entered, commands will not be canceled even if CS is set to HIGH. (To cancel a command,
either turn off the power supply, or input the command once again.)
11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet BR9020.PDF ] | |
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