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8 Mbit Firmware Hub
A Microchip Technology Company
SST49LF008A
Data Sheet
Table 1: Pin Description
Interface
Symbol
Pin Name
Type 1 PP FWH Functions
A 10 -A 0
Address
I X
Inputs for low-order addresses during Read and Write opera-
tions. Addresses are internally latched during a Write cycle. For
the programming interface, these addresses are latched by R/
C# and share the same pins as the high-order address inputs.
DQ 7 -DQ 0 Data
I/O
X
To output data during Read cycles and receive input data during
Write cycles. Data is internally latched during a Write cycle. The
outputs are in tri-state when OE# is high.
OE#
WE#
Output Enable
Write Enable
I
I
X
X
To gate the data output buffers
To control the Write operations
IC
Interface
I
X
X
This pin determines which interface is operational. When held
Configuration
Pin
high, programmer mode is enabled and when held low, FWH
mode is enabled. This pin must be setup at power-up or before
return from reset and not change during device operation. This pin
is internally pulled- down with a resistor between 20-100 K ??
INIT#
Initialize
I
X
This is the second reset pin for in-system use. This pin is inter-
nally combined with the RST# pin; If this pin or RST# pin is
driven low, identical operation is exhibited.
ID[3:0]
Identification
I
X
These four pins are part of the mechanism that allows multiple
Inputs
parts to be attached to the same bus. The strapping of these
pins is used to identify the component.The boot device must
have ID[3:0]=0000 and it is recommended that all subsequent
devices should use sequential up-count strapping. These pins
are internally pulled-down with a resistor between 20-100 K ??
FGPI[4:0] General Pur-
pose Inputs
I
X
These individual inputs can be used for additional board flexibil-
ity. The state of these pins can be read through GPI_REG regis-
ter. These inputs should be at their desired state before the start
of the PCI clock cycle during which the read is attempted, and
should remain in place until the end of the Read cycle. Unused
GPI pins must not be floated.
TBL#
Top Block Lock
I
X
When low, prevents programming to the Boot Block sectors at top of
memory. When TBL# is high it disables hardware write protection for
the top block sectors. This pin cannot be left unconnected.
FWH[3:0]
CLK
FWH4
FWH I/Os
Clock
FWH Input
I/O
I
I
X
X
X
I/O Communications
To provide a clock input to the control unit
Input Communications
RST#
WP#
Reset
Write Protect
I
I
X
X
X
To reset the operation of the device
When low, prevents programming to all but the highest address-
able blocks. When WP# is high it disables hardware write protec-
tion for these blocks. This pin cannot be left unconnected.
R/C#
Row/Column
I
X
Select For the Programming interface, this pin determines whether
Select
the address pins are pointing to the row addresses, or to the column
addresses.
RES
Reserved
X
These pins must be left unconnected.
V DD
V SS
NC
Power Supply
Ground
No Connection
PWR
PWR
I
X
X
X
X
X
X
To provide power supply (3.0-3.6V)
Circuit ground (OV reference) All V SS pins must be grounded.
Unconnected pins
T1.4 25085
1. I = Input, O = Output
?2011 Silicon Storage Technology, Inc.
6
DS25085A
10/11
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相关代理商/技术参数
SST49LF008A-33-4C-NH 制造商:SST 制造商全称:Silicon Storage Technology, Inc 功能描述:2 Mbit / 3 Mbit / 4 Mbit / 8 Mbit Firmware Hub
SST49LF008A-33-4C-NHE 功能描述:闪存 8M (1Mx8) 33MHz Commercial Temp RoHS:否 制造商:ON Semiconductor 数据总线宽度:1 bit 存储类型:Flash 存储容量:2 MB 结构:256 K x 8 定时类型: 接口类型:SPI 访问时间: 电源电压-最大:3.6 V 电源电压-最小:2.3 V 最大工作电流:15 mA 工作温度:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体: 封装:Reel
SST49LF008A-33-4C-NHE_ 制造商:Microchip Technology Inc 功能描述:
SST49LF008A-33-4C-NHE-T 功能描述:闪存 8M (1Mx8) 33MHz 3.0-3.6V Commercial RoHS:否 制造商:ON Semiconductor 数据总线宽度:1 bit 存储类型:Flash 存储容量:2 MB 结构:256 K x 8 定时类型: 接口类型:SPI 访问时间: 电源电压-最大:3.6 V 电源电压-最小:2.3 V 最大工作电流:15 mA 工作温度:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体: 封装:Reel
SST49LF008A-33-4C-NHE-T-CUT TAPE 制造商:Microchip 功能描述:SST49LF Series 8 Mbit 1024 K x 8 3.3 V Firmware Hub - PLCC-32
SST49LF008A-33-4C-WH 制造商:SST 制造商全称:Silicon Storage Technology, Inc 功能描述:2 Mbit / 3 Mbit / 4 Mbit / 8 Mbit Firmware Hub
SST49LF008A-33-4C-WHE 功能描述:闪存 8 MBIT FIRMWARE HUB RoHS:否 制造商:ON Semiconductor 数据总线宽度:1 bit 存储类型:Flash 存储容量:2 MB 结构:256 K x 8 定时类型: 接口类型:SPI 访问时间: 电源电压-最大:3.6 V 电源电压-最小:2.3 V 最大工作电流:15 mA 工作温度:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体: 封装:Reel
SST49LF008A-33-4C-WHE_ 制造商:Microchip Technology Inc 功能描述: