CD4521B consists of an oscillator section and 24 ripple-carry binary counter stages. The oscillator configuration (using IN1) allows design of either RC or crystal oscillator circuits. IN1 should be tied either HIGH or LOW when not in use. A HIGH on the RESET causes the counter to go to the all-0’s state and disables the oscillator. The count is advanced on the negative transition of IN1 (and IN2). A time-saving test mode is described in the Functional Test Sequence Table and in Fig. 6.

The CD4521B types are supplied in 16-lead dual-in-line plastic packages (E suffix), 16-lead small-outline packages (M, M96, MT, and NSR suffixes), and 16-lead thin shrink small-outline packages (PW and PWR suffixes).

• Reset disables the RC oscillator for low-power standby condition
• VDD’ and VSS’ pins are brought out from the crystal oscillator to allow use of external resistors for low-power operation
• Maximum input current of 1 A at 18 V over full package-temperature range: 100 nA at 18 V and 25°C
• Common reset
• 100% tested for 20-V quiescent current
• 5, 10 and 15 V parametric ratings
• Standardized symmetrical output characteristics
• Meets all requirements of JEDEC Tentative Standard No. 13B, "Standard Specifications for Description of ’B’ Series CMOS Devices"

Data sheet acquired from Harris Semiconductor

• Function
• Frequency divider
• Bits (#)
• 4
• Technology Family
• CD4000
• Supply voltage (Min) (V)
• 3
• Supply voltage (Max) (V)
• 18
• Input type
• Standard CMOS
• Output type
• Push-Pull
• Features
• Standard speed (tpd > 50ns), Partial power down (Ioff)

CD4521B的完整型号有：CD4521BE、CD4521BM、CD4521BM96、CD4521BMT、CD4521BNSR、CD4521BPW，以下是这些产品的关键参数及官网采购报价：

CD4521BE，工作温度：-55 to 125，封装：PDIP (N)-16，包装数量MPQ：25个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：NIPDAU，TI官网CD4521BE的批量USD价格：.153（1000+）

CD4521BM，工作温度：-55 to 125，封装：SOIC (D)-16，包装数量MPQ：40个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网CD4521BM的批量USD价格：.334（1000+）

CD4521BM96，工作温度：-55 to 125，封装：SOIC (D)-16，包装数量MPQ：2500个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网CD4521BM96的批量USD价格：.134（1000+）

CD4521BMT，工作温度：-55 to 125，封装：SOIC (D)-16，包装数量MPQ：250个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网CD4521BMT的批量USD价格：.334（1000+）

CD4521BNSR，工作温度：-55 to 125，封装：SO (NS)-16，包装数量MPQ：2000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网CD4521BNSR的批量USD价格：.146（1000+）

CD4521BPW，工作温度：-55 to 125，封装：TSSOP (PW)-16，包装数量MPQ：90个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网CD4521BPW的批量USD价格：.134（1000+）

14-24-LOGIC-EVM 支持 14 到 24 引脚 PW、DB、D、DW、NS、DYY 和 DGV 封装的通用逻辑 EVM

该 EVM 设计用于支持采用 14 至 24 引脚 D、DW、DB、NS、PW、DYY 或 DGV 封装的任何逻辑器件。