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參數(shù)資料
型號: ICS87008AGILFT
廠商: IDT, Integrated Device Technology Inc
文件頁數(shù): 1/16頁
文件大小: 0K
描述: IC CLOCK GENERATOR 1:8 24-TSSOP
標(biāo)準(zhǔn)包裝: 2,500
系列: HiPerClockS™
類型: 時鐘發(fā)生器,扇出配送,多路復(fù)用器
PLL:
輸入: HCSL,LVCMOS,LVDS,LVHSTL,LVPECL,LVTTL,SSTL
輸出: LVCMOS,LVTTL
電路數(shù): 1
比率 - 輸入:輸出: 2:8
差分 - 輸入:輸出: 是/無
頻率 - 最大: 250MHz
除法器/乘法器: 是/無
電源電壓: 2.375 V ~ 3.465 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 24-TSSOP(0.173",4.40mm 寬)
供應(yīng)商設(shè)備封裝: 24-TSSOP
包裝: 帶卷 (TR)
其它名稱: 87008AGILFT
87008AGI
www.idt.com
REV. B JULY 31, 2010
1
ICS87008I
LOW SKEW, 1-TO-8
DIFFERENTIAL-TO-LVCMOS/LVTTL CLOCK GENERATOR
GENERAL DESCRIPTION
The ICS87008I is a low skew, 1:8 LVCMOS/LVTTL Clock
Generator. The device has 2 banks of 4 outputs and each
bank can be independently selected for
÷1 or ÷2 frequency
operation. Each bank also has its own power supply pins so
that the banks can operate at the following different voltage
levels: 3.3V, 2.5V, and 1.8V. The low impedance LVCMOS/
LVTTL outputs are designed to drive 50
Ω series or parallel
terminated transmission lines.
The divide select inputs, DIV_SELA and DIV_SELB, control the
output frequency of each bank. The output banks can be
independently selected for
÷1 or ÷2 operation. The bank enable
inputs, CLK_ENA and CLK_ENB, support enabling and disabling
each bank of outputs individually. The CLK_ENA and CLK_ENB
circuitry has a synchronizer to prevent runt pulses when
enabling or disabling the clock outputs. The master reset
input, nMR/OE, resets the
÷1/÷2 flip flops and also controls the
active and high impedance states of all outputs. This pin has
an internal pull-up resistor and is normally used only for test
purposes or in systems which use low power modes.
The ICS87008I is characterized to operate with the core at 3.3V
or 2.5V and the banks at 3.3V, 2.5V, or 1.8V. Guaranteed bank,
output, and part-to-part skew characteristics make the 87008I
ideal for those clock applications demanding well-defined
performance and repeatability.
FEATURES
Eight LVCMOS/LVTTL outputs (2 banks of 4 outputs)
Selectable differential CLK1, nCLK1 or
LVCMOS clock input
CLK1, nCLK1 pair can accept the following differential
input levels: LVPECL, LVDS, LVHSTL, SSTL, HCSL
CLK0 supports the following input types:
LVCMOS, LVTTL
Maximum output frequency: 250MHz
Independent bank control for
÷1 or ÷2 operation
Glitchless, asynchronous clock enable/disable
Output skew: 105ps (maximum) @ 3.3V core/3.3V output
Bank skew: 70ps (maximum) @ 3.3V core/3.3V output
3.3V or 2.5V core/3.3V, 2.5V, or 1.8V output operating
supply
-40°C to 85°C ambient operating temperature
Available in both standard and lead-free RoHS compliant
packages
BLOCK DIAGRAM
PIN ASSIGNMENT
nMR/OE
DIV_SELA
CLK1
nCLK1
CLK0
CLK_ENA
CLK_SEL
CLK_ENB
DIV_SELB
QA0:QA3
QB0:QB3
1
0
1
0
1
0
÷1
÷2
4
LE
D
ICS87008I
24-Lead TSSOP
4.4mm x 7.8mm x 0.92mm body package
G Package
Top View
LE
D
CLK1
nCLK1
VDDOA
QA0
QA1
GND
QA2
QA3
VDDOA
DIV_SELA
CLK_ENA
VDD
CLK0
CLK_SEL
VDDOB
QB0
QB1
GND
QB2
QB3
VDDOB
DIV_SELB
CLK_ENB
nMR/OE
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
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