7B991

更新时间： 2024-01-04 05:31:17

品牌	Logo	应用领域
麦斯威 - MAXWELL		时钟
页数	文件大小	规格书
17页	246K
描述
Programmable Skew Clock Buffer (PSCB)

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7B991 技术参数

生命周期：	Active	包装说明：	RAD PAK, DFP-16
Reach Compliance Code：	compliant	HTS代码：	8542.39.00.01
风险等级：	5.6	输入调节：	STANDARD
JESD-30 代码：	R-XDFP-F32	长度：	20.828 mm
逻辑集成电路类型：	PLL BASED CLOCK DRIVER	功能数量：	1
反相输出次数：		端子数量：	32
实输出次数：	8	最高工作温度：	85 °C
最低工作温度：	-40 °C	封装主体材料：	UNSPECIFIED
封装代码：	DFP	封装形状：	RECTANGULAR
封装形式：	FLATPACK	认证状态：	Not Qualified
Same Edge Skew-Max（tskwd）：	1.2 ns	座面最大高度：	3.7338 mm
最大供电电压 (Vsup)：	5.5 V	最小供电电压 (Vsup)：	4.5 V
标称供电电压 (Vsup)：	5 V	表面贴装：	YES
温度等级：	INDUSTRIAL	端子形式：	FLAT
端子节距：	1.27 mm	端子位置：	DUAL
宽度：	12.192 mm	最小 fmax：	80 MHz
Base Number Matches：	1

7B991 数据手册

7B991

Programmable Skew Clock Buffer (PSCB)

BLOCK DIAGRAM DESCRIPTION

Phase Frequency Detector and Filter

These two blocks accept inputs from the reference frequency (REF) input and the feedback (FB) input and generate

correction information to control the frequency of the Voltage-Controlled Oscillator (VCO). These blocks, along with

the VCO, form a Phase-Locked Loop (PLL) that tracks the incoming REF signal.

VCO and Time Unit Generator

The VCO accepts analog control inputs from the PLL filter block and generates a frequency that is used by the time

unit generator to create discrete time units that are selected in the skew select matrix. The operational range of the

VCO is determined by the FS control pin. The time unit (t_U) is determined by the operating frequency of the device and

the level of the FS pin as shown in Table 1.

TABLE 8. 7B991 FREQUENCY RANGE SELECT AND t_UCALCULATION

2,3

fNOM (MH^Z)

t_U= 1/fNOM X N

A^PPROXIMATEFREQUENCY (MHZ)

AT WHICH t_U= 1.0 ns

WHERE N =

M^IN

MAX

LOW

MID

22.7

38.5

62.5

HIGH

1. For all three state inputs. HIGH indicates a connection to V . LOW indicates a connection to GND, and MID indicates an

open connection. Internal termination circuitry holds an unconnected input to V /2.

2. The level to be set of FS is determined by the “normal” operating frequency (f_NOM) of the V_COand Time Unit Generator (see

Logic Block Diagram). Nominal frequency (f_NOM) always appears at 1Q0 and the other outputs when they are operated in their

undivided modes (See Table 9). The frequency appearing at the REF and FB inputs will be f_NOMwhen the output connected to

FB is undivided. The frequency appearing at the REF and FB inputs will be f_NOM/2 or f_NOM/4 when the part is configured for a

frequency multiplication by using a divided output as the FB input.

3. When the FS pin is selected HIGH, the REF input must not transition upon power-up until V_CChas reached 4.3V.

Skew Select Matrix

The skew select matrix is comprised of four independent sections. Each section has two low-skew, high-fanout driv-

ers(xQ0, xQ1), and two corresponding three-level function select (xF0, xF1) inputs. Table 9 below shows the nine pos-

sible output functions for each section as determined by the function select inputs. All times are measured with respect

to the REF input assuming that the output connected to the FB input has 0t_Uselected.

09.23.02 Rev 4

All data sheets are subject to change without notice

1...5 6 789 10 11...17

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