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參數(shù)資料
| 型號： | DS1222 |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | BankSwitch Chip(存儲器組切換芯片) |
| 中文描述： | SPECIALTY MICROPROCESSOR CIRCUIT, PDIP14 |
| 封裝： | 0.300 INCH, DIP-14 |
| 文件頁數(shù)： | 1/4頁 |
| 文件大?。?/td> | 46K |
| 代理商： | DS1222 |
DS1222
BankSwitch Chip
DS1222
022698 1/4
FEATURES
Provides bank switching for 16 banks of memory
Bank switching is software-controlled by a pattern
recognition sequence on four address inputs
Automatically sets all 16 banks off on power-up
Bank switching logic allows only one bank on at a time
Custom recognition patterns are available to prevent
unauthorized access
Full +10% operating range
Low-power CMOS circuitry
Can be used to expand the address range of
microprocessors and decoders
Optional 16-pin SOIC surface mount package
DESCRIPTION
The DS1222 BankSwitch Chip is a CMOS circuit de-
signed to select one of sixteen memory banks under
software control. Memory bank switching allows for an
increase in memory capacity without additional address
lines. Continuous blocks of memory are enabled by se-
lecting the proper memory bank through a pattern rec-
ognition sequence on four address inputs. Custom pat-
terns available from Dallas Semiconductor can provide
security through uniqueness and prevent unauthorized
access. By combining the DS1222 with the DS1212
Nonvolatile Controller x16 Chip, up to 16 banks of static
RAMs can be selected.
PIN ASSIGNMENT
NC
PFI
AW
AX
AY
AZ
GND
NC
BS4
BS3
BS2
BS1
NC
Vcc
CEO
AW
AX
AY
AZ
GND
NC
BS3
BS2
BS1
Vcc
DS1222 14-Pin DIP
(300 Mil.)
See Mech. Drawings
Section
DS1222S16-Pin SOIC
(300 Mil.)
See Mech. Drawings
Section
PFI
CEO
CEI
CEI
1
2
3
4
5
6
7
14
13
12
11
10
9
8
1
11
10
12
13
14
2
3
4
5
6
7
8
9
15
16
BS4
PIN DESCRIPTION
A
W
-A
Z
CEI
CEO
NC
BS1,BS2,
BS3,BS4
PFI
V
CC
GND
– Address Inputs
– Chip Enable Input
– Chip Enable Output
– No Connection
– Bank Select Outputs
– Bank Select Outputs
– Power Fail Input
– +5 Volts
– Ground
OPERATION – BANK SWITCHING
Initially, on power-up all four bank select outputs are low
and the chip enable output (CEO) is held high. (Note:
the power fail input [PFI] must be low prior to power-up
to assure proper initialization.) Bank switching is
achieved by matching a predefined pattern stored within
the DS1222 with a 16-bit sequence received on four ad-
dress inputs. Prior to entering the 16-bit pattern, which
sets the bank switch, a read cycle of 1111 on address in-
puts AW through AZ should be executed to guarantee
that pattern entry starts with bit 0. Each set of address
inputs is clocked into the DS1222 when CEI is driven
low. All 16 inputs must be consecutive read cycles. The
first eleven cycles must match the exact bit pattern as
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1222+ | 功能描述:IC BANKSWITCH CMOS 14-DIP RoHS:是 類別:集成電路 (IC) >> 存儲器 - 控制器 系列:- 標準包裝:45 系列:- 控制器類型:靜態(tài) RAM（SRAM） 電源電壓:4.5 V ~ 5.5 V 工作溫度:0°C ~ 70°C 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應商設(shè)備封裝:16-SOIC W 包裝:管件 |
| DS1222N | 功能描述:IC BANKSWITCH CMOS IND 14-DIP RoHS:否 類別:集成電路 (IC) >> 存儲器 - 控制器 系列:- 標準包裝:45 系列:- 控制器類型:靜態(tài) RAM（SRAM） 電源電壓:4.5 V ~ 5.5 V 工作溫度:0°C ~ 70°C 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應商設(shè)備封裝:16-SOIC W 包裝:管件 |
| DS1222S | 功能描述:電源開關(guān) IC - 配電 RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關(guān)閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| DS1222S+ | 功能描述:IC BANKSWITCH CMOS 16-SOIC RoHS:是 類別:集成電路 (IC) >> 存儲器 - 控制器 系列:- 標準包裝:45 系列:- 控制器類型:靜態(tài) RAM（SRAM） 電源電壓:4.5 V ~ 5.5 V 工作溫度:0°C ~ 70°C 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應商設(shè)備封裝:16-SOIC W 包裝:管件 |
| DS1222SN | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
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