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參數(shù)資料
| 型號： | SY89231UMG TR |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 9/15頁 |
| 文件大小： | 0K |
| 描述： | IC CLOCK DIVIDER LVDS 16MLF |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 系列： | Precision Edge® |
| 類型： | 時鐘除法器 |
| PLL： | 無 |
| 輸入： | CML，LVDS，PECL |
| 輸出： | LVDS |
| 電路數(shù)： | 1 |
| 比率 - 輸入:輸出： | 1:1 |
| 差分 - 輸入:輸出： | 是/是 |
| 頻率 - 最大： | 3.2GHz |
| 除法器/乘法器： | 是/無 |
| 電源電壓： | 2.375 V ~ 2.625 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-VFQFN 裸露焊盤，16-MLF? |
| 供應(yīng)商設(shè)備封裝： | 16-MLF?（3x3） |
| 包裝： | 帶卷 (TR) |
Micrel, Inc.
SY89231U
November 2007
M9999-110507-A
hbwhelp@micrel.com or (408) 955-1690
3
Pin Description
Pin Number
Pin Name
Pin Function
1, 4
IN, /IN
Differential Input: This input pair is the differential signal input to the device,
which accepts AC- or DC-coupled signal as small as 100mV. The input internally
terminates to a VT pin through 50
. Note that this input pair will default to an
indeterminate state if left open. See “Input Interface Applications” subsection for
more details.
2
VT
Input Termination Center-Tap: Each side of the differential input pair terminates
to the VT pin. The VT pin provides a center-tap for the input (IN, /IN) to a
termination network for maximum interface flexibility. See “Input Interface
Applications” subsection for more details.
3
VREF-AC
Reference Voltage: This output biases to VCC–1.2V. It is used for AC-coupling
inputs IN and /IN. Connect VREF-AC directly to the VT pin. Bypass with 0.01F
low ESR capacitor to VCC. Due to limited drive capability, the VREF-AC pin is
only intended to drive its respective VT pin. Maximum sink/source current is
±0.5mA. For more details, see “Input Interface Applications” subsection.
5
EN
Single-ended Input: This TTL/CMOS-compatible input disables and enables the
output. It is internally connected to a 25k
pull-up resistor and will default to a
logic HIGH state if left open. When disabled, Q goes LOW and /Q goes HIGH.
EN being synchronous, outputs will be enabled/disabled after a rising and a
falling edge of the input clock. VTH = VCC/2.
6
/MR
Single-ended Input: This TTL/CMOS-compatible input, when pulled LOW,
asynchronously sets Q output LOW and /Q output HIGH. Note that this input is
internally connected to a 25k
pull-up resistor and will default to logic HIGH
state if left open. VTH = VCC/2.
7
NC
No Connect
8, 13
VCC
Positive Power Supply: Bypass with 0.1F in parallel with 0.01F low ESR
capacitors as close to the VCC pins as possible.
12, 9
Q, /Q
Differential Output: The output swing is typically 325mV. The output must be
terminated with 100
across the pair (Q, /Q). See the “Truth Table” below for the
logic function.
10, 11, 14,15
GND,
Exposed Pad
Ground: Ground and exposed pad must be connected to a ground plane that is
the same potential as the ground pins.
16
DIV_SEL
Single-ended Input: This TTL/CMOS-compatible input selects divide-by-3 when
pulled LOW and divide-by-5 when pulled HIGH. Note that this input is internally
connected to a 25k
pull-up resistor and will default to logic HIGH state if left
open. VTH = VCC/2.
Truth Table
Inputs
Outputs
DIV_SEL
EN
/MR
Q
/Q
X
0
1
0
1
÷3
1
÷5
X
0
1
0
1
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