参数资料
型号: SST25LF020A-33-4I-SAE-T
厂商: Microchip Technology
文件页数: 6/27页
文件大小: 0K
描述: IC FLASH SER 2MB 33HZ SPI 8SOIC
标准包装: 2,000
系列: SST25
格式 - 存储器: 闪存
存储器类型: FLASH
存储容量: 2M (256K x 8)
速度: 33MHz
接口: SPI 串行
电源电压: 3 V ~ 3.6 V
工作温度: -40°C ~ 85°C
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
供应商设备封装: 8-SOIC
包装: 带卷 (TR)
2 Mbit SPI Serial Flash
A Microchip Technology Company
SST25LF020A
Not Recommended for New Designs
Hold Operation
HOLD# pin is used to pause a serial sequence underway with the SPI flash memory without resetting
the clocking sequence. To activate the HOLD# mode, CE# must be in active low state. The HOLD#
mode begins when the SCK active low state coincides with the falling edge of the HOLD# signal. The
HOLD mode ends when the HOLD# signal’s rising edge coincides with the SCK active low state.
If the falling edge of the HOLD# signal does not coincide with the SCK active low state, then the device
enters Hold mode when the SCK next reaches the active low state. Similarly, if the rising edge of the
HOLD# signal does not coincide with the SCK active low state, then the device exits in Hold mode
when the SCK next reaches the active low state. See Figure 4 for Hold Condition waveform.
Once the device enters Hold mode, SO will be in high-impedance state while SI and SCK can be V IL or
V IH .
If CE# is driven active high during a Hold condition, it resets the internal logic of the device. As long as
HOLD# signal is low, the memory remains in the Hold condition. To resume communication with the
device, HOLD# must be driven active high, and CE# must be driven active low. See Figure 19 for Hold
timing.
SCK
HOLD#
Active
Hold
Active
Hold
Active
1242 F03.0
Figure 4: Hold Condition Waveform
Write Protection
SST25LF020A provides software Write protection. The Write Protect pin (WP#) enables or disables
the lock-down function of the status register. The Block-Protection bits (BP1, BP0, and BPL) in the sta-
tus register provide Write protection to the memory array and the status register. See Table 4 for Block-
Protection description.
?2011 Silicon Storage Technology, Inc.
6
DS25080A
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